You don't have a power supply listed. Get one from Antec, Corsair, Seasonic or XFX.
The XFX Core Pro650W
$89.99 ( $59.99 after rebate ) is good but you can get by with less.
500-650W is the range you should be looking at.
GPU: Sapphire 6870
$174.99 for example will do nicely.
The stuff you have listed will work together just fine.