so newegg has 7870ghz for 140? and R9 290s for 400... 2 7870s for 280 IS DAMN GOOD... but should I just hold off for astound sound, and the other what nots of the r9 290? I've been looking for benchmarks of the 2 but can't seem to find them I suspect that the 7870ghzx2 will outperform the single card but am not sure can I get some help here?