Hi hover,
Saw your post over on Scubadiving.com. I would agree with some of the advice you received over there = APEKS. I have been researching my first reg choice for a few months now and have chosen the Apeks TX-100 after a lot of research, questions and trying one recently in the water.
Why -- a few reasons. First, even the most cursory research on various scuba-related sites on the web will turn out a ton of uniformly positive comments on Apeks regs. See the link below from scubadiving.com regarding their ratings of "new" regulators. While this is not a definitive resource on higher end regs (they only rate new or recently updated models in this article), it still shows that the Apeks regs stack up VERY well against some very good competition. Do a quick search on this site and others using the word "Apeks" and you'll get many useful responses.
Second -- other divers I know have very good things to say about them....very well-built; tough-can take a lot of abuse without a decrease in performance; environmentally sealed first stage (keeps out water more effectively); effective in colder water situations (I live in New England), etc., etc. This includes some of my more technical diving friends. These regs are also used by some of the world's elite technical/cave divers -- a meaningful endorsement if there ever was one.
Third -- I used the reg in the water and I found it easy breathing and comfortable.
Some things to mention -- larger than average second stage....I did not find this to be noticeable at all, but if you do lots of traveling and want a minimlist reg, perhaps this could be an issue. Non-standard hoses -- to me this is not a big deal, but to some tech divers who want to standardize the hoses they use, this can be somewhat of a big deal. The reg comes with a 1/2" inch hose for the second stage ("standard" is 3/8"). Port orientation -- also not totally standard -- some of the ports are at a slight angle...again not a big issue to most, but if you are particular about your hose routing, this could have a slight impact on your gear config. Swivel (TX-50) vs. non-swivel (TX-100). I prefer a non-swivel first stage -- personal preference.
Anyway, hope this is helpful. Good luck with your search.
http://www.scubadiving.com/gear/16newregs/review.shtml