Well, you don't need a video card to watch DVDs and videos. I watch them on this laptop just fine with integrated video. Plays Tribes just fine, too. (And Civ 4, which surprised me but is awesome).
I mean, it just sounds like you want more computer than you need or intend to use. You can easily pay $1000 and get a great machine...but if all you're doing is playing Tribes and surfing the net, you're wasting your money.
I'd really consider a nice laptop if your main concerns are dvd/tribes/web browsing. You can get a very decent machine under $800-1000.
Otherwise, you could probably get what you want with about a $500 desktop