i understand its all fridge, i saw one on craigslist also that was 1000$ and had freezer / fridge. the space is not a issue i can fit a 10x10foot fridge ;P the biggest issue is that it is 20 years old already (says 2001 and 2000 for manufacture date) so how long will it last before the repair is needed and getting someone to come repair it or taking it there sounds like a hassle since im 90 miles from a big city.That's all fridge. No freezer. Subs are also made for built in spaces.
I guess my point is, no reason to spend 3 grand on something unless its something special. A 1k fridge will probably last longer than a 3k fridge because has less things to go wrong.
If your space makes sense for a sub zero i would not hesitate to go that way. They usually don't it in a space for a regular home depot fridge, taller because the compressor is on top, counter depth.