Hmmm, what sort of diving are you doing? Where?
Apeks regulators are highly recommended, especially the TX50/TX40 combination, or the ATX50/ATX40 combination. The ATX series has smaller second stages, and I think the first stages are identical. If you are looking at doing any sort of technical diving in future, get the Apeks DS4 first stage rather than the Apeks DST first stage (which is standard) - they have the same internal components, but the DS4 does not have the swivel feature, or the oddball 1/2" hose fitting of the DST. I have a DST, but am looking to replace it with a DS4. About the only Apeks regulator I have heard less than positive reviews about is the ATX200 - it's also the most expensive, so its easy to avoid!
These regulators have cold water features, but are just as usable in any environment you could name. The ATX/TX50 second stage also has user adjustable breathing resistance control, a useful feature for deeper dives. The second stage is also easy to pull apart without tools, so it's easy to maintain in terms of cleaning out minor sand and silt contamination if you do a lot of shore diving with surf exits/entries (even if you have them properly clipped off, some sand will still get in there).
You also need to consider Yoke versus DIN fitting. If you own your own tanks, DIN is by far the more secure connection, with much reduced risk of blowing a tank o-ring, but if you rent, yoke valves may be all that are available. Adapters are available, and you can easily convert the Apeks first stages from yoke to DIN and vice-versa for about $35, with a do-it-yourself kit, that reputedly only takes a couple of minutes (haven't done it myself), so don't be too worried about buying the wrong type of fitting up front - you can convert it later.
These regs can also be had for a steal if you buy online, but there may be warranty issues (but it is highly unlikely that you would need to call in the warranty on these - they're first class in terms of quality).
hope this helps,
Ben