Need some help picking parts

[dreyankee]

So I'm looking to upgrade my gaming rig, and need some help choosing between parts. I'm hoping to play games at max settings, and the only thing I use my computer for other than gaming is school work. No editing or stuff like that. Will overclock if I run into a game that won't run great without it, but not a major concern. I already have a case from my current pc, optical drive, OS, mouse, keyboard, and monitor (1920x1080).

Price range: Looking to spend around $800-900

Build Date: Possibly within the next week

Things that are set in stone

CPU: Intel Core i5-3570K Ivy Bridge 3.4GHz
http://www.newegg.com/Product/Product.aspx?Item=N82E16819116504

CPU Cooler: XIGMATEK LOKI SD963 92mm HYPRO Bearing CPU Cooler
http://www.newegg.com/Product/Product.aspx?Item=N82E16835233081

Case: NZXT GAMMA Classic Series GAMA-001BK Black Steel ATX Mid Tower Computer Case
http://www.newegg.com/Product/Product.aspx?Item=N82E16811146061
The case that I have now. Only reason to buy a new one would be if GPU won't fit, or some other freak thing.

Storage: 1TB Mechanical drive from current PC
Will buy an SSD in the future, but not too important now.

GPU:SAPPHIRE 100352-2L Radeon HD 7950 3GB 384-bit GDDR5 PCI Express 3.0 x16 HDCP Ready CrossFireX Support Video Card
http://www.newegg.com/Product/Product.aspx?Item=N82E16814202006
Have been set on this card for a while, the two free games and rebate just sweeten the pot now.

Things up in the air

Motherboard and RAM: GIGABYTE GA-Z77-HD4 LGA 1155 Intel Z77 HDMI SATA 6Gb/s USB 3.0 ATX Intel Motherboard with UEFI BIOS
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128580

FREE:Crucial Ballistix Sport 8GB 240-Pin DDR3 SDRAM DDR3 1600
http://www.newegg.com/Product/Product.aspx?Item=N82E16820148540

Comes with 8GB of free RAM, which is really cool. Not many reviews though and can't find on pc part picker to check compatibility. Will it be able to handle everything? If not, what MOBO would be better?

PSU: Cooler Master eXtreme Power Plus 500w Power Supply
http://www.amazon.com/Cooler-Master-eXtreme-Supply-RS500-PCARD3-US/dp/B001G0WPLK/ref=cm_srch_res_rtr_1
This is the PSU in my current PC. Will I be able to transfer it, and not have to worry about fires or any other shenanigans?
Or should I just go ahead and buy a new one like this>CORSAIR Builder Series CX600 600W ATX12V v2.3 80 PLUS BRONZE
http://www.newegg.com/Product/Product.aspx?Item=N82E16817139028
Will I only need more than 500W if I overclock?

I'm helping my buddy build his new computer this week, and it really gave me the itch to build for myself. I just don't know too much about motherboards, and would like some feed back from more experienced builders regarding that and my PSU. Any replies are appreciated.

 

[djangoringo]

I'd get a new psu, that cooler master psu is rubbish.
For a psu : http://www.newegg.com/Product/Product.aspx?Item=N82E16817207013&Tpk=xfx%20550w
or http://www.newegg.com/Product/Product.aspx?Item=N82E16817182132
For a motherboard get this : http://www.newegg.com/Product/Product.aspx?Item=N82E16813128546
It's better, that one is a low series from gigabyte.
Also get a dual channel kit of 8GB ram : http://www.newegg.com/Product/Product.aspx?Item=N82E16820148662

 

[dreyankee]

Okay, thanks. I bought my current PC prebuilt and figured the PSU was skimped on. Will 600W be enough on the power supply if I decide to overclock?

 

[djangoringo]

Yes, even 550W will do, like the xfx 550, which is a high quality psu, it has better internal parts than the corsair cx.

 

[dreyankee]

Thanks. I'll check that one out too.