Since you already have a Core i7 2600 which is non overclockable there is no point in getting a P67 board. Unless you are going for a multiple GPU setup and you feel that you need the x8x8 PCIE bandwidth then get the P67.
Otherwise on a H67 board with a single discrete GPU will be just fine. You are also able to use the onboard Intel HD2000 with the H67 board, IGP disabled with a P67 chipset motherboard. Intel QuickSync is also disabled with the P67 chipset as the IGP is disabled.
I suggest going for the Asus P8H67-M Pro. I do not recommend the Asus P8H67-M LX because it lacks a lot of future connectivity like USB 3.0. I also do not recommend the Asus P8H67-M Deluxe because it is more suited as a HTPC motherboard.