I'm trying to get a Radeon 6870 and a Good PSU for around $250.

This PSU will have to abel to run:
Phenom ii x4 965B.E.
Gigabyte 770T-USB3
4G DDR3 1333Mhz
Apevia 500 Watt
Radeon HD 5570
Samsung 20"

Can it be done?Both a PSU and 6870 for $250?
 
What, CF certified PSU for just $50? Not even close, do not cheap out on PSU, that's the most important thing inside your PC.
Also, many bad reviews of PowerColor card, look, $200 for that card and you can see the other brand are about $250...
 
Going from HD5570 to HD6850 is a GREAT BIG JUMP performance and I'm pretty sure you can maxed out almost everything on 20" monitor, no need CF 2xHD6850, one of them is more than enough. :)
GTX460~HD5830.
HD5850>HD6850. But 6xxx series gives you higher minimum fps and CF-scaled more better than 5xxx series...