Help with 3 parts for cheap gaming build

help/advise on $250 to $300 gaming pc parts (no more than $300)
i got $300 ( got the rest of the parts for building a pc) but wanting to know best bang for the buck for cpu/motherboard and graphic cards for $300 for a cheap games pc for me son to play games liek gears of war, call of duty ,nhl 09 etcetc

i was looking at
1/ cheap x2, amd board ,and $150 good card
http://www.newegg.com/Product/Prod [...] 6813138128
http://www.newegg.com/Product/Prod [...] 6819103300
http://www.newegg.com/Product/Prod [...] 6814150316

or quad 9600 ,cheap board,and $100card


http://www.newegg.com/Product/Comb [...] mbo.153832
http://www.newegg.com/Product/Prod [...] 6814102719
or a cheap

Core 2 Duo E7300 Wolfdale 2.66GHz or e5200 with cheap motherboard and $100 card
http://www.newegg.com/Product/Prod [...] 6813128357

http://www.newegg.com/Product/Prod [...] 6814102719


or e8400 cheap m/b and $ 100 card

http://www.newegg.com/Product/Prod [...] 6813128357

http://www.newegg.com/Product/Prod [...] 6814102719
if anyone esle as got any ideas for me ty in advance

i am not into gaming pc myself but built 5 muiltemedia pc in the past i just want best bang for the bucks with $300 for a average gaming pc

In your first build since the 790GX is a crossfire capable motherboard you should go with a HD4830, not the 9800GT. While they both have similar performance, you could always crossfire another card in the future for added performance.

The 4th choice would give you the best performance, while the G31 is a very budget motherboard, the E8400 would far outperform the 7750 or 9600 in pure gaming performance. Of your 4 options, i'd probably go with the E8400, G31 and this HD4830 for $85 after rebate
http://www.newegg.com/Product/Prod [...] 6814131129

My second choice is the 7750Kuma, 790GX and a HD4830.

At a $300 budget i'd probably go with these 3. They run $310 before shipping and rebates, but there's $25 in rebates. The E7400 at $120 (same price as the E7300), the Gigabyte P45DS3L $80 after rebate motherboard and a Sapphire HD4830 $85 after rebate (benchmarks for the 4830 aren't quite equal to, but pretty decent))

http://www.newegg.com/Product/Prod [...] 6819115206
http://www.newegg.com/Product/Prod [...] 6813128345
http://www.newegg.com/Product/Prod [...] 6814102803

this 9800GT is $92 after rebate, but it's a $30 rebate so initial cost is pretty high.
http://www.newegg.com/Product/Prod [...] 6814500080