hows it goin fellow aussie.
-don't waste your money with SLI it's a complete waste of money, one 8800GTX will be more than enough to handel any game at max resol. at very high frame rates, search google for it's performing frame rates. SLI is marketing nonsense
-get a EVGA 8800 card from shadowentertainment.com.au, i just bought the EVGA 8800GTS KO ACS3 and i'm sure it will kill any game when i install it, so i can't even imagine what a EVGA 8800GTX could do
-don't worry about what others say with e6600 vs e6700, on a price per performance the e6600 would clean up but if you want the e6700 get it... i did.
-i'd recommend the corsair hx620w power supply that will be more than enough power even if you really want to SLI... 700w is an overkill and i'd say corsair has an edge over ocz and it's a modular psu.
-not sure about the mobo, research it on google and be sure, check out the ASUS P5b-deluxe - solid mobo, very highly rated by all
-all the rest looks pretty good, i'd consider just geting air cooled system with a zalman 9700, water cooling is very expensive probs very unnessacary...