Honestly, a used horn from one of the "classic" brands would be a better investment IMHO. More proven, consistent quality. I believe I saw a few Yamaha Neo's (EXCELLENT instruments) on ebay for sub-5000 recently. It seems like you can typically find a used Willson, Besson, or Yamaha for around, if not less than, that.
Sean Kissane
Low Brass Specialist, Paige's Music
Principal Euphonium, Indianapolis Brass Choir
Principal Euphonium, Crossroads Brass Band
Equipment:
S.E. Shires EUSOLO
Warburton Gail Robertson mpc