what are the benefits of PCIE 2.0 and Upgrade Questions?

hello all

i,m needing a new rig soon, and may as well use the latest of latest, ddr3 is so high at the moment but i may opt for that.

my question is, i had a good experience of the asus 965 deluxe mobo and was thnking of getting the p35 version ddr3 buit i read about the x38 and i see that pcie 2 is just around the corner, is there a huge benefit of this?

i,m not overclocker, not intersted in SLI or XFire, the system will be kitted with 4 hhds and 8800GTX and 2GB ddr3 1333 ram if i can afford it:)

thanks all