kinda depends on what type of diving you do..for he purpose of this thread Ill assume standard open water...I own the mosquito which is exactely the same as the stinger but in a plastic case with plastic lense, its a good computer for what I use it for (OW) never had any problems, you can change the battery yourself (not so with Stinger) a word of warning you should get a lense protector as the lense scratches very easily...the Gekko is a great computer seemingly bomb proof I have friends who use this, very easy to read very simple to use, although it can be wrist mounted it is larger than a wrist watch type comp eg the mosquito, the Gekko can also be console mounted, the battery can also be changed by the user, be aware it has no backlight so night diving youll need to use a torch to read it. I would recommend the Gekko over the mosquito, easier to read easier to use. The oceanic atom 2.0 is the same as the Aeris epic both rated highly by ScubaDiving Magazine, (although the Aeris higher than the Oceanic, not sure why coz they are the same computor with minor cosmetic diffs) they are way more expensive than the mosquito or Gekko (Gekko is the cheapest) but have the capacity for many diff types of diving, the face is mineral crystal so should be harder to scratch and are also user battery replaceable. They are also AI ( air intergrated) with the oceanic I believe its an option but with the Aeris I thinks it comes as a package uping the price from around $600 to almost $1000, you may be able to find cheaper, im not sure. And as Diver 85 has said the Veos are supposed to be pretty good too, cheap and simple although I have no first hand knowledge...think about what diving you currently do, what diving you may do in the future, if you dont need a million functions dont by a super flash expensive comp as its a waste get what you need with fucntions YOU WILL USE...good luck...hope this helps...there is alot of info and reviews on the net about dive computers, look for reviews on the items youre intersted it and you should be good....