New i5 build

APPROXIMATE PURCHASE DATE: Before the end of the month. Going to run Windows 7 when its out. BUDGET RANGE: $1000AUD (this is flexible)

SYSTEM USAGE FROM MOST TO LEAST IMPORTANT: Will be a bit of gaming, Want it to run Modern Warfare 2 nicely. Music, Surfing net, Office works etc

PARTS NOT REQUIRED:
Case - I have got a new Antec 902
http://www.pccasegear.com/index.ph [...] ts_id=8767

Power Supply - I have a Corsair HX620W
http://www.pccasegear.com/index.ph [...] ts_id=5153

Not too worried about keyboard, mouse, optical drive or monitor at this stage.

PREFERRED WEBSITE(S) FOR PARTS: http://www.pccasegear.com It doesnt have to be from here but its the best AU website I can find COUNTRY OF ORIGIN: Australia

PARTS PREFERENCES:
CPU - Intel Core i5 750
http://www.pccasegear.com/index.ph [...] s_id=12404

Motherboard - Gigabyte P55-UD4 or P55UD4P (whats the difference?)
http://www.pccasegear.com/index.ph [...] s_id=12625

OVERCLOCKING: Maybe in the future SLI OR CROSSFIRE: No, If I was to would you recommend a bigger PSU?

MONITOR RESOLUTION: 1920x1080, 1920x1200, I havent looked into this too much,<---- Are these resolutions standard for a 23 inch moniter?

ADDITIONAL COMMENTS: So I have been doing some research into all this and I have decided to go with the Core i5 and a mid range Gigabyte motherboard. I have been a little confused with what Ram to get, ive heard that P55 works best with 4GB and I know that I need DDR3 running at 1.65v or less.

Would you recommend any of these CPU coolers?
http://www.pccasegear.com/index.ph [...] 207_23_845

I have a Seagate external hardrive already, would you recommend sticking with Seagate or are there better brands for Hard Drives? I would want at least 500GB.
http://www.pccasegear.com/index.ph [...] th=210_344

The graphics card I have been looking at is the 1 GB Radeon 4870, I think it should give me more than enough power to run a few new games. One question I have is if I was to run 2 moniters in the future would I need to get two cards and run them in crossfire?
http://www.pccasegear.com/index.ph [...] s_id=10981 or
http://www.pccasegear.com/index.ph [...] s_id=12198

Build's recommendations seem sound, the Ripjaws are getting recommendations all over the forums, and for good reason. 24" standard res is 1920x1200 I imagine a 23" would be 1920x1080. Just check the resolutions before you purchase your monitor.

I have just been looking at the ATI 5750 and 5770s and I think I may just hold off on deciding on a graphics card until these come out, I think it will be worth the wait.

Thanks for the recommendations on the CPU cooler, RAM and HDD, I will look into these now