I would argue that used kegs are a poor investment these days. Twenty years ago, one could purchase used soda kegs that looked almost new after a thorough cleaning, and they sold for as little as $10.00 each. Most of the used soda kegs that being sold today look like they were on the losing end of a fight with a gorilla, and most stores want $70.00+ per keg.
I'll second this. You can sometimes get a good deal on used. More often you're getting something banged up and after you fix what ails it you coulda bought new.
To the OP, I think both of my regulators are Taprite. I know for a fact that the one that gets the most use is.