I think about the only charges you can realistically control here a dreamhost are registrations and donations. After that you're looking at disk and bandwidth and if you can't catch when they're going to go nuts on you and you don't put a restriction in place you probably deserve to be charged more.
Wholly - IS NOT MY PROMO CODE. Even worse, I don't get any credit for it. Use WhollyMindless for full credit. I'm really disappointed in someone.