Not to be simple, but are you asking about a phono stage or a step-up transformer/pre pre-amp? If you are really looking for versatility and the best sound, you have to consider these items seperately. And you don't have to spend more than $300 for a passive step-up and around the same amount for a tube-based phono with power supply that will sound as good as anything else out there, even price no object. That will let you spend more money on the TT itself. Keep visiting DIY horn/tube guys in whatever town you are in, or whenever you travel. You'll find the best stuff with these guys.
RonyW