you want to stick with the Intel P45 chipset >>>>>>>>the P43 is lame for a gaming board
have a look at the GA-EP45-Ds3l or GA-EP45-UD3L both awesome choices
E8400 is the best choice of the cpu's you referenced
look for coolermaster centurion case
OCZ 700 watt power supply
http://www.ebuyer.com/search?q=GA-EP45-Ds3l&x=24&y=9
http://www.ebuyer.com/product/152506
http://www.ebuyer.com/product/147113
your price desires really take you out of the gaming world; unfortunately