I have had CB balls refuse meals before. This to a newbie would be kind of scary, and a bit of a hassle. I mean as expierienced owners alot of us know its normal to slow down. But some balls can be very temperature specific. I don't recommend them to any newbie. And I personally just dont like them.
I recommend corns or rats. Most rats come with worse temperments then corns. Both are very similiar species and very nice looking. If you get a CB corn they are usually quite hardy and eat very well. Edwin's advice for buying a CB animal is the best you can do. Buy a well started juvinile.