The DX's came with a few more accessories - grips and sight inserts, but in particular they were hand selected for accuracy, and factory test targets were included. The price on them won't be going down, anytime soon.
The 5" pre-lock 629 I just bought was slightly used, without a box, and was reasonable in price - not much more than the street price of a new one. I plan to shoot the heck out of it, so it's not a collector gun to me. The 5" blued Classics (not DX) seem to bring a little more money than the 629's
The 5" full lug 29/629 is an awfully well balanced gun. It is tolerable with full-power loads, reasonable to carry, and easy to shoot well. There are plenty of revos that have more power, but they are usually a lot bigger and heavier, or they are single actions
