I am pretty torn. I think the OCZ would probably do great. I have a P5N-E I'm going to reveive with a E6400. I am only planning on OCing it to about 2.4 - 2.6ghz. I might go up to 3.0 - 3.2 but not too sure.
From reading the reviews the OCZ seems to OC pretty damn good.
The G.skill ends up being $60 more in the end b/c of the rebate on the OCZ, but it is DDR2800 vs. the 667 of the OCZ.
I truthfully don't know if that makes that much of a difference and I am very torn on what to go with. Both seem to be great sets of memory, so it's hard.