What Motocross bike to get, advice?

Hello, i am looking to get a new motocross bike, i have been looking at getting any model in a 125. I have a limit of �900 so not a loy to play with. A 125 Husqvarna has just come up, its 2003 and looks fantastic and has been well looked after, i can get it for �800 which seems good. BUT are husky's any good for motocross and should i stick to rm, cr, yz, kx etc? Advice would be great!!!! thanks