i would definitely use ivy bridge as it is much faster - at least when you use win for some games (on linux only old games work due to missing features). one other aspect is that ivy has got support for 24000/10001 refresh rate if you really can see the difference to 24 hz. I do not use it on a flat tv only with a 60 hz tft. Last thing: the price is basically the same, so why shoud somebody buy sandy bridge? Also ivy needs a bit less energy.