It's not exactly an answer to your question, but have you thought of looking on G-INFO for owners/operators of TB200s (although there aren't many), or other similar socata types, then contact them.
Are there any owner's groups you could join, that may be a good source of recommendations or warnings.
I would say though, that as a private owner, (rather than a flying school), it's perhaps less important to have your maintenance organisation on your doorstep.
I'd be more concerned with getting the right company, who ideally are experienced with the type and will do a good job, even if it's an hour or two's flight away.