Which Changer to Buy?

Does it make a difference which of changer you get
if you end up a using a program like CDJ? After doing
some quick research, it looks to me like the main
differences between the 210 and 270 are software features.
They all look to have the same sound-quality related
features.
Is the SLink interface supported to the same degree in all
changers?
Right now I don't see any reason for not buying the 210.
Any comments/suggestions appreciated.