I'm in the market for my first compressor. I've narrowed it down to the DBX 266 ($125), RNC ($175) or better yet a used unit in the same price range for less money. While the RNC has tons of good reviews it seems limited since the two channels do not operate independently. It's also at the top of the price range. I record lots of drums so I think this would be important. There are lots of used units on e-bay for 40%+ off. If the seller has excellent feedback and claims everything is working should I beware of a unit thats been sitting in a rack fo 6 to 10 years or go for it and save some $. Any comments?