Wouldn't call 1000s obsolete. You could get two 800s and a mixer cheaper because there is a massive difference in performance and quality between the two players. +1 to what GREMMIS said. The mk3 has the best build quality of all cdj models. Much better than the newer range. It has more RAM than 850s and can read CD data quicker. If you want a solid CD playing unit go with 1000s. If you want to future proof your kit in terms of firmware updates and support/USB functionality go with the newer models. Had you bid on those and won, I would say you've done an alright deal. It's not crazy cheap but it's towards the cheaper end of the scale most definitely. A pair of mk3s going for 550 is quite ridiculous!