You have two decent options when it comes to track wheels. You can build yourself a pretty good set of wheels and have them be pretty all around. So ideally a flip flop good hub, and nice clincher rim. This way they can be used for any race, and warming up. Or you can drop more money and have a set of training/ warm-up wheels and a set of race wheels. The race wheels can be some really really nice hubs and tubular rims.
It depends on what track youre racing, your own personal goals, and your finances.