Can't comment on either of those two regs sorry as I have no personal experience with either. I imagine both would do the trick as there aren't any bad i.e will kill you, regs on the market. How well they breathe is of course another matter. Many, not all, regs will have two HP ports but it is something you obviously need to check. As far as I know all regs are nitrox comparable to 40%, titanium regs are not advised to be used with nitrox greater than 40% due to possible combustion, reaction with high O2.
Regs are mostly about personal preference and you will get many recommendations, usually the reg the individual owns.
You won't go wrong with any of the big players, ScubaPro or Aqualung for example. Some of the smaller players also offer good regs at often more reasonable prices HOG or DiveRite for example.
Servicing is a consideration i.e how easy it is to get serviced in your local area, often you can post somewhere to get servicing if you really need to. If you travel dive a lot servicing in tropical locales should be considered both ScubaPro and Aqualung generally have the bigger service networks. Having the same brand primary and octo can make life easier as some shops will service one brand and not another.
A good reg IMO is the Aqualung Titan, cheapish, reliable and a good breather. But like I said almost all will be fine for Rec OW diving. Although I have a feeling it may only have 1 HP port.
There are many reviews on many different regs on this board, have a wee look for some user reviews.
FWIW I dive Apeks and Atomic regs, both breathe the same to me. Over the years my Apeks have proven to be very reliable but I believe they are a little spendy in the US. Atomic make nice regs and the Z2 I believe is around $399 and at that price great value to performance ratio.
Good luck with your search.
---------- Post added June 14th, 2013 at 11:41 AM ----------
Fishpie, I type too slow...
---------- Post added June 14th, 2013 at 11:42 AM ----------
Or too much lol...