Both units below are wristmount - no air integration.
#1:
Uwatek Aladin Sport (air only) - bought at a shop in the Caymans when I got sick and tired of being the first back on the boat every dive because of the tables square profiles (everyone else had computers). I think around 275 US (probably a high price but I didn't care at the time) a few years ago.
I've been very happy with it and will probably give it to my nephiew as he wants to get into diving and will be old enough next year (I won't let him use it till he has at least 5-10 dives after OW done as I want to be sure he's fully familiar with the tables).
#2:
Cochran Comander 2 gas nitrox - LDS purchase for quite a bit due to getting several options like extended memory and battery life.
As it records and calculates data every second instead of every 5 or 10 seconds as many of the current computers do, you can really see clearly what you were doing when you look at the profile on a PC screen after downloading the unit.
The 2 gas version allows for a second, higher O2% nitrox sling or pony bottle for decompression gass at the end of a dive.
Also got the optional yellow backlighting ($60 US) as my buddy has colorvision problems and has dificulty with red. He got the same modle/options as we figure we dive together with almost identical profiles so this allows us to be somewhat redundant for each other should either computer fail.
So far, the only complaint I have heard about it is that the temperature gauge is very slow to react and because of this it tends to read high on short, cold dives. My buddy also isn't all that impressed with the software package (sold seperately in regular and pro versions).
Personaly, I think the software is just fine but I guess it's a preference thing.
The price can be anywhere from around 300 US or so to over 1200 depending on what options you want it to have. It is also upgradeable for any options you didn't initially take by sending it back to the factory for upgrades (and paying for them...
).