I am currently working on my first build for a mid-range gaming system. I have already bought the case but was wondering if all other components are compatable with each other and if there is anything that i should change.
Check www.jonnyguru.com on that PSU; seems to me it was a Rosewill of that wattage that they approved. Otherwise, Rosewill PSUs are on a "Do not buy" tier of a commonly used (though somewhat dated) PSU listing at http://www.tomswiki.com/page/Tiered+PSU+Listings?t=anon.
There are a lot of newer models that aren't listed, but if you stick to Corsair, OCZ, Antec, PC Power & Cooling, Enermax, or other brand with nothing below tier-3, you should be fine. Newegg has some really good deals right now on some Antec, OZC, and even a PC P&C model.
Motherboard: save $10, get a P5Q Pro. You lose the Wi-Fi (if you care, add a PCI-card for it). You get a better fsb for overclocking, and the ability to run Crossfire at 8x+8x in PCI-E 2 slots. In comparison, the P5K runs it at 4x on PCI-E 1 for the second card, which means 4 times less bandwidth and really hurts. http://www.newegg.com/Product/Product.aspx?Item=N82E16813131299
Video card: Georgy is right, get a HD 4850. With the PSU and MB I suggested, you can add a second video card later. Trust me, a system with two HD 4850 cards is very impressive. OK, you'd have to pay another $100 or $150 for the second card at some point, but it will help a lot.
Thanks everyone for the advice. I understand the points you guys/gals make about the PSU and mobo and video card, but one question i have. Whats the real difference between DDR2 800 an DDR2 1066? It seems everyone swears by the 800 and I'm not exactly sure why???
The "800" is usually cheaper, and still fast enough to run in a 1:1 ratio if used with a P45 or X48 motherboard. For example E8400 can run at 3.6GHz on a P45 (fsb 1600) with DDR2-800 and all the numbers match nicely (all multiples of 400 MHz).
Also, some motherboards have trouble recognizing the DDR2-1066.
+1 to aevms suggestion on hdd (640gb), huge improvment for 25 bucks.
and +1 to 4gb ddr-800 for $8. more RAM much better than 1066 vs 800. But do keep in mind if you aren't running a 64bit OS it won't recognize all of it.
4850 is a solid increase if you do the other recommendations. sets you up nicely for not having to change for a bit and still able to add another if you choose.
Actually there is no reason for that choice. The only advantage I could really see would be the P5Q-E has eSATA but that really isn't all the huge of a concern to me and I don't think its worth the extra $29 in my case. Good eye, thanks!