sounds like you are running an extremely cpu intensive setup. the 2011 gives great performance boosts for calculation encoding decoding ops but no real advantage for gaming FPS.
the new chip you are talking about hasent been benched or at least i havent seen one so i do not know if its any better than the 1155 series. the two that are currently out are much better. another thing to consider is the RAM that ive seen for 2011 costs its weight in gold and tha alone may push you over $ 1k whereas ram for 1155 is cheap.
also the 2600k which is a 1155 can e overclocked very well with an aftermarket aircooler, ive seen claims of 4.8 ghz on aircooling with aftermarket BUT i think you are really looking at 4.5-4.6.
hope ive helped a little and ASUS is the way to go for MB in my opinion