Hi guys, I'm in the market for a display and found a 24" ACD which is pretty much mint condition (only 7 hours of use), with all accessories, paperwork and box and receipt for $500. Is that a good price for a used 24" ACD? Also, my second question is, whether or not I should consider a used 27" ACD for $750... at $250 more than the 24". Need to decide in a few hours since I'd like to pick it up this afternoon. Advice please!