I'm not a big fan of the OCZ VX. It is some really nice memory, but I worry about the long term effect running that stuff at 3.3 to 3.5 wil have on the modules as well as the board.
for the review, you should check out the first article, in it I explained what components i used, and the second article was simply a follow up.
I used Corsair's XMS 3200LL at 2-3-2-5. stuff runs awesome, overclocks like a champ and never needs more than 2.85V.
As Yves said, I'd really go for the 2x512MB kit, more than enough for anything right now..
I just got in a 2GB set of OCZ that runs at 2-3-2-5 and am going to start working on an article chronicling 1GB vs 2GB kits and their effect on performance....more specificially gaming.
BTW, New Egg has a great deal on that memory, $237 for a 2GB kit after a mail in rebate (not a plug, just where I bought mine).