pretty much anything you want. i would say if you're going to go down and buy somthing find a dr. and get a prescription first. if you don't and get caught by the police you'll have to buy your way out or go to jail. the prescription won't mean anything when you try to bring it back into the us...
have you thought of going with 1/4 plywood or evean 1/8 part. board, might be a little cheeper? The board is a gloss white. might be good for somthing like this.