It all depends upon how you wish to use the dot.whatever. If you want to be able to use it right away, I would suggest that you go with the TigerDirect version "dot.tiger". If you are looking for a challenge and wish to join the quest to unlock the Spanish (as in Spain, not Mexico) version, then by all means go with the "dot.bob" version.
The dot.tigers have already been refurbished by TigerDirect, so they are already functional. They have a debian 3.0 linux distribution installed. However, I do not believe the phone works with these systems. I could never get my phone to work on the one I received. My dot.tiger came with 64Megs of RAM and a 4Gig Hard Drive. This is the same as the specs for the dot.bobs, even though the TigerDirect description claims 128Meg and 10Gig.
The dot.bobs come all locked up, not physically, but through the firmware and the Operating System. You can review the messages on this forum and you will discover a few clues as to what's necessary to 'attempt' an unlock of dot.bob. BUT as of today, I don't know of any success' in unlocking the units. Which means they are pretty much useless until someone does discover a way to unlock them.
As mentioned before, I have a dot.tiger, but I am also expecting my dot.bob tomorrow via UPS. I, like others on this forum, look forward to the challenge of finding a way to unlock the dot.bobs. If you feel up to the challenge, I am sure everyone here would welcome your participation. As I type this message, it appears that BOB still has one up on e-bay for $100.00 with free shipping. If you don't mind taking up the challenge or waiting for someone to come up with an unlock solution, that's about half of what TigerDirect will charge you after shipping.