Precision Motorcars IS an excellent dealership. I've always been pleased with their service.
Rick's European is also a good one; we've been using them for as long as I can remember. I don't have their address or number here, but you should be able to find it in the phone book; also, they're in Clearwater, not Tampa.
If you want a true independent, you might also try Ledbetter's; it's over near the fairgrounds in Temple Terrace. I guess that's somewhat out of the way for you if you're in Clearwater, though.
... now all I need is to find a shop down here in Ft. Lauderdale that's as good as the ones I used in Tampa.
'83 240D, 250k miles