hmm.. I'd ask  Rega
dad seems to know ALOT about computers. I'll link him this journal via skype and have him look at it when he wakes up

I can't narrow it down, but make sure the onboard sound has an amplfier. some companies cheap out on this and you'll end up hearing whispers at max volume

also, realtek audio sucks donkey balls, nothing but problems i've had with them.

Get an i5 minimum. i3s are too wimpy for gaming. :P Or an i7 if you can manage it, since having 4 cores is really beneficial, especially as games take advantage of multiple cores more and more.
And considering that RAM is pretty inexpensive, it's worth getting 16GB! Still, no reason you couldn't start with 8 and upgrade later.

Also, http://www.newegg.com/ :p they've got excellent search for PC parts.

i AM on a budget here lol

Spring for the i5, really. You'll be much better off. :D It will last you MUCH longer. An i3 will already hamstring you with a number of modern games.
It isn't -that- much more. And there's likely no need to replace your PSU, unless you have specific problems running with it.

Also, price compare Amazon and Newegg. Sometimes one is better than the other.

Also, Newegg has a promo right now with a $20 bundle discount if you buy the CPU + Mobo together. http://promotions.newegg.com/intel/.....ml?icid=227035

Alternatively, you could skip the bundles and get the CPU separately.
http://www.newegg.com/Product/Produ.....82E16819116896
or for $20 more... http://www.newegg.com/Product/Produ.....82E16819116899

between those two motherboards, i'd go for the gigabyte. Although i might be slightly biased. I've only ever had gigabyte and asus Motherboards, and never once had an issue with either. (both are pritty good for overclocking, should you do that too.)) Cant really say much about ASrock. Dont know anyone that has one myself. so i cant vouch for them.

power req for the Graphics card is 400 minimum..and apparently the CPU is pretty low on power consumption too. so 700w should be good (if not dare i say maybe even slightly overkill depending on the rest of your system. but its better to have more and not use it, since it leaves room for upgrades and other components too.)

Again as Zeeky says.. make sure the on-board sound is good for your needs too, Although the last gigabyte mobo i had had a pretty damn amazing built in sound system. (although personally no issues when i had realtek..but their one of those company's you'll seem to either love, or have nothing but issues with XD)

Although as Firon says..if your looking for heavy duty gaming, i would recommend dumping any spare money you might have left over in to a higher end cpu..although Intel is crazy expensive as you go higher end.. ((Seriously..£1100 for the new octo-cores..i know they have the hyper thread tech..but..geez..i payed less than that for my entire pc i have now.. o..o))

hope it helps! (although probably not.. XD)

ASRock is a branch of ASUS. Pretty good motherboards. Gigabyte is a little more expensive but decent quality as well. If you're on a budget though, I'd go with ASRock or go to Newegg.com and try searching for ASUS motherboards. I use one and it is fantastic.

Built a computer recently. :P If you want more detailed help, add me on skype.

beware of bottle necking, blue dude~