The Gigabyte 7900GT comes with dual DVI-I ports. I don't know if all, but some, came with two adapters to convert those to vga and with an i/o box, and a game (
see here). None of these items is in the listing, most importantly if you only have vga available you will need the DVI converter (here in the USA I can find them on eBay for $2.50 but I don't know about AU.) But yes that is a better card when new. Always ask if it was overclocked as this runs the cards hotter and wears them out faster.
The powercolor is not as good a card but it comes with 1 vga & 1 dvi native to the card.
Every time I buy impulsively on eBay I overpay. Like Cat said you can often find it cheaper at a store. If you want the 7900 then run a search for "buy 7900gt" or "buy gigabyte 7900gt" and see what prices you can find and if it comes with items you want or need, like the dvi to vga adapters.
I took 3 or 4 weeks before I bought my video card at the price I wanted to pay - and then when I got it it didn't have the game he advertised so I got another $20 off. I don't play games that often, I would just have used it to test my cards abilities so I preferred the savings anyway