alright, so i'm pretty set on getting an ampeg svp pro. my qsc rmx 850 is on it's way. i'm looking at 3 different used svp's. one is alot older, VERY affordable, and the guy says it's in great condition, w/ new tubes. the other two are alittle newer, alittle more expensive, but again...they say they're in perfect condition. non are the original owners. i could afford a new one...i got a great price on a new one, it'd be alittle more, but i could pay it off, instead of sending a money order all at once. if something goes wrong with it, i could always go back to the store, plus i'd have the ampeg warranty. what would you guys suggest?