Wine Storage - Eurocave versus Sub Zero?
if you talk to serious wine collectors (at least those that don't have an actual cellar), Eurocave is #1 (I have 3). Not cheap, but very reliable and well designed.
No direct experience with SubZero, but you'll definitely be paying for the trendy name and look.
Post a question on wineberserkers and you'll get lots of opinions (erobertparker is a pay site now).