Opie,
You'll be fine diving the Stealth or Razor then. I'll pose another question - where do you plan on doing your vacation diving? If it's anywhere tropical, I would say to stay away from the "bigger" systems. 99%of the rest of the world is renting out al80's, and those bigger systems look terrible with them.
From what I understand, Steve is based in Europe right now, but on his way back down to Mexico for the winter. I've purchased his videos, and it is the same training that you would receive from some of the shops in Mexico (where he learned to sidemount). It's top notch!. And this is coming from a guy that learned to cave dive in Florida. If you're looking for training and equipment that would suit you for a variety of diving, rather than just cave filled 108's, then by all means book with Steve for when he's in Mexico or check out ProtecPlaya or Tulum (where the Stealth was originated). There's definitely nothing wrong with a winter vacation in Mexican cave country! Lots of topside stuff to do after the dives, and some beautiful caverns and caves to play around in.
I own the Stealth and dive it with al80s, lp85s and lp95s dry. It's the favourite out of all my sidemount rigs.