I have a reverso. it is lighter, but both ATC guide and reverso are perfectly fine. My understanding is that the ATCG is a little bit more user friendly. You will be happy with either one.
I don't know exactly how the IME "bargin bin" works, so maybe I should just keep my mouth shut... but... if it is just items that IME isn't going to carry anymore, by all means take the deal. If it is USED stuff, then be wary of anything that is soft. Don't buy ropes, slings, draws, etc. If the cam is slung (which I think all cams are now), resling them. I am of the opinion that a well inspected piece of used hardware is okay to use, but that is just my opinion. That being said, I don't own anything used.