I like the Asus P8Z68-M Pro as a nice micro board but at around $125 it is a really nice board and if you matched it up with a processor like the Intel® Core™ i5-2500K (at $220) you would have one of the top gaming processors on the market and the ability to overclock it in the future.
have you tried overclocking your current cpu.. a decent cooler will knock you back 50 or so bux and in the short term will be a good investment. as your current cpu isnt a bad model just a little short on the ghz side.. if you can add another say 500mhz then you should be golden.the average im seeing for it is 3.3 which should be plenty to release the bottleneck if you have 1. which will give a few more months for which you can save up some extra and get a decent board and i5 2500k.
you could plumb for a cheaper 2400 and it would still be a great upgrade but the 2500k is the model of the moment and rightly so...
I might go with the Intel BOXDP67DEB3 LGA 1155 Intel P67 but can I overclock my CPU with this mobo? (the IPIEL-LA3 mobo didn't allow overclocking). Now for a good CPU cooler, I found this one on Amazon but will it fit my mobo?