Digital BW, The Print

Hi all

I'm in the market for a densitometer and I would appreciate some 
advice if you can spare time and have an opinion.

What is the minimum "Spec" one needs in the creation of curves? Are 
there any makes / models to avoid. ANY advice would be appreciated, 
bye the way I'm NOT loooking at a new one!!!

Cheers for now...

McGillicuddy