Look for the Solution 3 here on AT Classifieds. Can probably get one at or just below $100.
Definitely a very fine release and you can shoot it BOTH back tension hinged release style, or with a thumb trigger as it's convertible.
Other than that, find a Carter with the ITS that fits your hand nicely. You'll want a very heavy trigger spring as that would help you learn how to shoot it with back tension easier and not punch so easily. With a medium or light spring, it's waaay to easy to command or punch even if you think you're using back tension.
But seriously, I would suggest a hinged release from any of the major manufacturers, the Solution 3 or the new Carter Evolution that's set to come out end of the month.
All the best.