hmmm is that chart is accurate then maybe a 7950 or 7970 would be better it cost only 10bucks more the the 7870
oh nvm was looking at 7970's crossfired. so yea i guess it is the best bang for buck 2x 7870's
i did not give a definitive answer because you seemed to know what you wanted and just presented some info; though i do not give 100% credence to TT 100% of the time; i really think you are on to something.
7870 CF being the "best bang for the buck" i don't know but i would not be surprised if it is. i'd suggest going for it, i doubt you will be dissatisfied.