What you planning on doing with it? Field Target, Hunter Field Target, plinking on the zero range, hunting ?
Since you're going to Nelson (is it still open?) I'll guess that it's FT you're thinking about.
In which case (if you're buying new) these would be my preference (in order of preference) :
They all have room for improvement, the LGU needs less work to make it a full race FT rig than the others.
The LGU is the only one I'd buy new, all the others I'd buy 2nd hand - If you can get a 2nd hand Mk1 or Mk2 TX they're much easier to be consistent with than a Mk3 TX.