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What power supply do I need for my new gaming system?

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Hello everyone. I am new to these forums but also new to the world of computer hardware. I've used computers constantly my whole life and am excited to finally be building my own. I've been doing a lot of reading (including on Tom's Hardware, which has amazing benchmark charts and articles), and I've decided on everything except the case and power supply. My aim with this build was to put together an affordable but durable overclocked gaming system that will play the vast majority of current games at 1920x1080 and high settings with smooth, consistent frame rates. Here it is:

ASRock P67 EXTREME4
Core i5-2500K
EVGA GeForce GTX 560 Ti, Crysis 2 edition
8 GB DDR3 1600 G.Skill Ripjaws X
Samsung Spinpoint F3 1TB HDD
Asus DVD burner

Concerning the case, I'll probably just get a cheap, minimalist one, perhaps one that comes with a power supply. Choosing the power supply is where I'm really stuck. Down the line I plan on getting another GTX 560 Ti for use in SLI, so I need a PSU now that will be able to support that as well. The eXtreme Power Supply Calculator ended up recommending at least 539W, but I thought that seemed low. So I thought I would see if anyone here thought it would be fun to give me a clue.

Please feel free also to comment on my hardware choices. So far I've only bought the memory and the graphics card.

As for overclocking the CPU, I realize that the more you push it, the more power you need, but I don't plan on pushing it all that far. I really just wanted to try out overclocking to see what it's all about.

Thanks in advance. :) 

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Honestly I wouldn't trust rosewills psus imo. Go with a more known brand like antec, corsair or seasonic.
750w Is more than enough for one card and gives you room the sli and overclock in the future. As for a minimalistic case, the fractal design define r3 is great.
Power supply Master

The minimum recommended power supply requirements for a 2-way GeForce GTX 560 Ti graphics card SLI system is 650 Watts or greater with a minimum combined +12 Volt current rating of 45 Amps or greater and with at least four 6-pin PCI Express Supplementary Power Connectors.

Total power supply wattage is not the critical value. The power supply must meet or exceed the minimum combined +12 Volt current rating spec as that is the rail that the CPU and graphics cards get all of their power from. If the power supply has more than one +12 Volt rail do not assume that you can just sum the amperage of each +12 Volt rail together. Unscrupulous PSU makers won't display the wattage for the combined +12V rails on the label affixed to the PSU which makes it difficult or impossible to determine the current rating.

Select from reputable PSU brands such as Antec, Corsair, Enermax, Seasonic and XFX and you'll be safe.
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Power supply Master

Ko888 is on the right track. None of those linked PSUs have the cables needed to run the GTX560TI in SLI. While 650W should be enough, you'll probably need to move to the 750s for the four PCIe plugs. He listed the brands I would buy, but there are others that could work.
Power supply Master

The following 620 - 660 Watt power supplies meet or exceed the +12 Volt current requirement and also have at least four PCI Express Supplementary Power Connectors so they do exist :

Antec True Power New TP-650, OEM Seasonic, Max. Load +12V : 648 W (54 A)

Corsair Professional Series CMPSU-650HX, OEM Seasonic, Max. Load +12V : 624 W (52 A)
Corsair Professional Series Gold CMPSU-650AX, OEM Seasonic, Max. Load +12V : 648 W (54 A)

Enermax Liberty ECO ELT620AWT-ECO, Max. Load +12V : 576 W (48 A)
Enermax Liberty ECO II ELT620AWT-ECO II, Max. Load +12V : 576 W (48 A)
Enermax Pro82+ EPR625AWT, Max. Load +12V : 600 W (50 A)
Enermax Pro82+ II EPR625AWT II, Max. Load +12V : 600 W (50 A)
Enermax Modu82+ EDM625AWT, Max. Load +12V : 600 W (50 A)
Enermax Modu82+ II EMD625AWT II, Max. Load +12V : 600 W (50 A)
Enermax Pro87+ EPG600AWT, Max. Load +12V : 600 W (50 A)
Enermax Modu87+ EMG600AWT, Max. Load +12V : 600 W (50 A)

Seasonic S12E Bronze S12E-650, Max. Load +12V : 624 W (52 A)
Seasonic X-series SS-650KM, Max. Load +12V : 648 W (54 A)
Seasonic X-series SS-660KM, Max. Load +12V : 648 W (54 A)

XFX Core Edition PRO650W (P1-650S-NLB9), OEM Seasonic, Max. Load +12V : 636 W (53 A)
Power supply Master

The 6xx Watt power supplies that have four PCI Express Supplementary Power Connectors only appear in the high end model lines so they are relatively expensive.

It's much easier to find power supplies with four PCI Express Supplementary Power Connectors available starting in the 750 Watt range as 4745454b has pointed out above.

if you are planning going sli go for a quad rail design psu, dont be blinded by those high wattage psu with a single rail and dual rail design with high ampere, because 2 graphics card will share power with only1 rail. dont look just for wattage psu, also look for the high ampere rating psu, if you will be using a high end "single" graphics card, it has a high ampere requirement, usually the psu with dual rail or the single rail design is the best choice because it will have more ampere rating on the 12v rail, unlike the quad rail it will be divided in 4 rail so the ampere rating on each rail will be lower, but quad rail design is much safer to use and it is better for sli/crossfire! because your gpu card will be powered by each dedicated rail, the 12v2 and the 12v4 rail which is good because they have their own source, unlike the dual rail if you have 2 graphic card it will share power on the the 12v2 because the 12v1 is for the cpu only and for single rail it will all share power on one 12v rail which is dangerous and unsafe according to the law.
i suggest you buy a 800w high ampere quad rail design psu. the FSP everest 800w will be one of your best choice for sli.
Power supply Master

Since the power supply calculator came up with 539W, getting a good 650W unit will suffice.. A 750W unit will just be extra insurance and thus is highly recommended.. If you are looking for a sub 100$ PSU then go for either the Antec EA-750 or the Corsair TX 750 V2.. Both of them are excellent units..

Thanks, everyone. Kind of funny how no one can ever seem to agree on this stuff. I finally decided to go with 4745454b's suggestion. The price went up since he posted, but I contacted Newegg customer service and they graciously let me have it for the older price of $80 and no shipping. :) 
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