Damn delicious dude. You did get OCZ Platinum Revision 2 right and not just the Revision 1 platinums? The Rev2 OC's even better.......personally you would been fine with 1gb and woulda gotten way better RAM OC"s......2x256 OC's insanely better than 512x2 and 1gbx2 ....well honestly I don't know because mose 'xtrememe world record' type people use like 2x512 for benching purposes.
The G.SKill and OCZ Platinum Rev2 both OC to really high FSB's with relatively low voltage and tight timings, so either one would be good.
Still freakin nice though man.
I'd suggest you flash those Ultras with a GT Bios, then use a program like Nibitor and change the GT's BIOS voltages to an Ultra then reflash it.
I say this because the GT's RAM timings are faster and you'd actually get better performance