well i was thinking of in case he wanted to sli rather then buying a new graphics card when the 8800gtx becomes a lil cheaper. In other words upgradeability
True but still...I don't think SLI is worth it much at all becuase of the heat and watts it take. I would just do the eVGA step-up to an 8900GTX in a few months.
I'd get a Seasonic S12 Energy+ 650w or a Corsair 620w, and even that might be too much power. Not familiar with buying parts in AU. Any other stores you can buy from that have a better selection?
650w would probably be enough for SLI'd 8800GTX's based off a PSU calculator I tried. Not sure how reliable it is though, and I didn't factor in the WC kit.
I would stick with the OCZ, it's a great PSU, and there's no such thing as too much juice.
plus it lets you stick as many HDDs, dvd drives, or peripherals in as you want and still be able to OC to the max.