P67 looks good but I'm thinking of adding an SSD in the future and I'm interested in the Z68's SRT. Haven't yet understood what SRT does but I think it boosts HDD performance. Besides I read somewhere that Ivybridge will be compatible with current P67/Z68 boards so why not choose the more "advanced" model.
About the memory, if the budget allows, I'll pick these
All the old parts that I'll be using are only about 1-2 years old and are still running perfectly. PSU is Seasonic, HDD is WDC and Case is a CM690 with 3 120mm R4 fans.