Thinking about buying cdjs to run in Serato HID Mode. Was almost going to pick up brand new XDJ 1000s but came across a pair of used 900 in excellent condition? Any big differences between 900 and 900nxs if I'm just using hid mode? I'm using an s9 so I pretty much have all the functions I need on the mixer.. am actually even thinking about 850 as well.