Right now the socket 1155 is the socket of choice. Most gamers are finding that the Intel® Core™ i5-2500K is the sweet spot of performance and value when matched up with a good P67 or a Z68 board.
Since very few games can take advantage of more than 4 threaded the value of the hyper-threading on processors like the Intel Core i7-2600K is very minimal in a gaming system. So save yourself almost $100 and go with the Intel Core i5-2500K.
Looking at a good sub-$200 board Z68 like the MSI Z68-GD65, ASRock Z68 Extreme4 or Asus P8Z68-V/Gen3 should give you a very nice platform to build your new gaming system around.
Intel Enthusiast Team