Your Motherboard has a PCI x16 slot, that means the video card will fit right in there. PSU is pretty much universal in 99% of cases. Here is an Antec 550w for the same price....Just an idea!
I honestly doubt that the GPU won't come with one of the adapters, I remember getting them when there was only one DVI port on cards (vga/dvi on a 6600 AGP).
yeah the 8800gt should always come with a dvi to vga adapter. i know a few people who have got different brand ones and they call came with 2 adapters.