4500MHD, ION, ION II, radeon HD 3200, radeon HD 4225.
Those are the ones that would run paintball at-least decently. ION II being the best alternative because of its automatic gpu switching (it has two gpu's), but it's not here yet. You'd have to wait a month or two for it (and pay $400-$550).
I'd suggest that you forget about playing pb2 on a netbook though, unless you're ok with almost notebook-like battery life. Just try to look for something that feels right. I.e. Good keyboard, doesn't lag too much while browsing, right kind of screen and so on.