I got a Gainward GF4 TI4200 - 128MB beast and it indeed kicks ass!! NVIDIA based of course!
Problem with onboard jobbies is often they use up the RAM,so slow your computer down alot.
Mine cost £170 and has Video output the lot.For me was worth the money as I work in digital animation and its pretty essential,but its still not a bad buy.
Here is the link to my one
http://www.microdirect.co.uk/company...iti48008xp.htm
PS,a great tool is RivaTuner,lets you adjust all the properties on the Direct X / OpenGL drivers,so you can opt for Quality,speed or a mix.
Anyhow..nuff said!