Well you can go with Acer, Asus, HP, Dell, HP, Leveno among various others. That will be your call.
But you will want at least a Core 2 Duo with 2GB of RAM and a dedicated Video card. Something like a Class 1 on our GFX Card list.
That will be roughly the specs you will want to run the games smoothly and with Medium GFX. You could always go for more RAM or something if the cost allows for it.