Gosh, thanks for all the input!
Well, the consensus seems to be to go with a reg first. Interestingly, this was not the way I had been leaning, I suppose because I've never had a rental reg that bothered me. On the other hand, it would only take one bad one to ruin a day of diving or worse.
Hi Damelfish. The service issue I was referring to was based on something I read recently in one of the dive magazines I get (can't remember which one), that implied that regs that get used every day tend to work better and have less problems with corrosion, etc. than ones that don't. This made me think rental regs might actually be in better shape, but it sounds like several of you think rental regs take a beating and are often in poor shape.
Anyway, I don't get to dive nearly as often as I like (local diving is cold with murky green water and few fish and not possible much of the year anyway), so this does necessitate flying to tropical locations. I'm not really willing to skip a trip to buy my own gear because I only manage a handful of dive vacations a year and giving up one would really cut down on my diving. The expense of these trips is partly why I have to budget and gradually purchase gear. (As a plus, I HAVE gotten a better feel for what I like and don't).
Scubaskipper, thanks for the tip on Aqualung maintanence. I used an Aqualung Calypso in Australia, and it was probably the reg I liked the best of the few I've used (Zeagle, something I don't recall, and Scubapro). Anyone have experience (good or bad) with that one?
Thanks!