Hi there,
I hope you don't mind if we offer an opinion; you are asking a great question and one we get frequently.
It sounds like you are wanting a great travel BC. The question is whether to invest in a jacket or harness/wing, correct?
The first thing you want to look at is how a jacket fits into your suitcase vs. a harness/wing. The first time I traveled with my jacket BC, it took up half of my STORM suitcase. The second time I traveled with my harness/wing, it took a fifth of my suitcase, which meant I had room for extra goodies like a spare wetsuit. You can try this same exercise at your local dive shop; just bring your suitcase along.
Next, you want to think carefully about your future in diving. I began with a great jacket BC and never, ever would have thought I would dive anything other than shallow reef diving. Six months later, I was in the Florida springs taking a cavern course and watching my shiny new BC get modified with duct tape and zip ties to make it safe for the cavern environment. Now, I am not talking about becoming a cave diver, I mean just doing beautiful open water caverns or really cool wrecks - you will find that a harness/wing combination gives you the trim you need to avoid kicking up the bottom and the streamlining to attach the accessories required (such as a reel, lights, etc.) that a jacket BC does not. With a harness/wing you have the ability to transition to other dive environments in the future. Even if you don't, you still have a great buoyancy compensator that will have you trimmed out in the water and better able to carry accessories for a night dive or open ocean dive that requires a seeme, etc.
Finally, if you do decide on the harness/wing...which one is right for you? That has a lot to do with personal preference. Our TransPac and TransPlate systems are designed to carry weight like a hiker's backpack - putting less strain on the shoulders and distributing the bulk of the load to the hips. This concept was designed after a cave exploration in Japan where our company founder had to carry his tanks in the mountains. The TransPac was so comfortable with heavy doubles that it became the harness of choice and is the latest innovation in harnesses.
We all dive the TransPac and TransPlate here and find them not only comfortable, but rugged and durable for our technical diving. Sounds like you don't need extra weight, so why not try a TransPac? You'll get the weight load distribution and have a harness that you can customize to fit you perfectly. Or come by one of our remaining Tech Tours and try a TransPac, a TransPlate and a Basic Harness - they are all good options and simply depend on what you want to do with your diving.
Check out our Tech Tours at
http://www.diverite.com/tour/
Hope this helps.
Cheers,
Kathleen