wait... i just got my 7600GT so your saying i cant get vista?
No, all DirectX 9 video cards can run Windows Vista without Aero (that is, Vista Basic), and most new DirectX 9 video cards will run the full Aero Premium interface.
According to Vista's system requirements, http://www.microsoft.com/windowsvista/getready/capable.mspx
to run Aero, the card must have:
"Support for DirectX 9 graphics with a WDDM driver, 128 MB of graphics memory (minimum), Pixel Shader 2.0 and 32 bits per pixel."
DirectX 10 cards will run both DirectX 9 and DirectX 10 games, but DirectX 9 cards will only run DirectX 9 games.
The first DirectX 10 cards are coming out next week, and will be very expensive, and, I suspect, will have very high power and case cooling requirements.