not the best combo , u better have intel proc with nvidia video card and amd proc with ati video card
Incorrect. An Intel processor will work fine with either an nVidia GPU or an ATI GPU. Similarly, an AMD processor and an nVidia GPU or an ATI GPU will get along just fine.
In general, ATI products are offering more/better features (DX11, Eyefinity) right now, and they're usually cheaper than similar nVidia products as well. The only problem that you can run into is that there are few AMD motherboards that support SLI.