I'm a great believer in "buy it nice, or buy it twice". But what you need to go on with more advanced diving is a backplate and wing that's well made and that works. I've never felt the need for harness or plate padding. I'll reserve judgment on the Cinch, because I've gotten some good reports on it, but the guy I saw demoing it last night wasn't happy, because he didn't get the harness "cinched" up enough, and his gear was sloppy on his back.
The ScubaPro regs are good regs, and ScubaPro stands behind their equipment for long periods of time, and all that's good; but if you are going to go into tech diving and acquire a stable of regulators, be aware that ScubaPro is quite difficult about certifying folks to service their regs, and does not make rebuild kits available to regulator owners. If all you have is one, it's no big deal. But at $100 or more per reg per rebuild, and required service every year, when you get to the 19 regs we own, it gets really painful.