with that card i believe that u can "unlock" it to perform like a x850xt pe...thus i doubt it makes much difference which one you get, if u are gonna unlock it. when i say "unlock" i mean that you can increase the number of pixel pipelines from 12(?) to 16 and increase the clock speed (that bit is just for the noobs, who dont know what it means
)...i am not sure how to unlock it but its meant to be real simple, so i suggest doing it...im sure if you google it you will find a step by step guide
for more info on the two cards, and the differences read this....
http://www.rage3d.com/board/showthread.php?t=33858602