My co-worker has the Total Gym 3000 and really likes it. She bought it for $400 plus shipping on SeenOnTVFitness.com.
Domina, her wheel broke too, they sent her a new revised one.
She then discovered that you can't use the old wheel and new wheel together and had to call them again. They sent her the other new wheel(s) for free.
Anyway, she is really happy with it and has me convinced to buy one (when I have a spare $500!)