If at possible get to a good shop to handle the pistols, and even better try some out (possible at a few shops that have a small test range, but more likely at a club or with a friend). Don’t worry about picking ONE, because you are probably going to end up with more in the long term!
The 92fs has real presence, is huge and heavy, but it not the best umerex 8 shot for accuracy or smoothness of trigger (CP88 is better). Good thing about the umerex rotary 8 shot pistols is that if your collection of guns increases, so does the number of mags – which also fits the Umerex Under Lever Action rifle (Winchester)
If you fancy a revolver type, then the Umerex 586 is a quality pistol, very accurate with a really nice trigger in single and double action, this uses a 10 shot rotary mag. This is a very nice pistol, and will last many years; even a ten year old used one can perform like new. As mentioned, Crosman do a more basic version which I expect is also accurate.
The downside of any CO2 gun is once gassed up, there is the obligation to ‘use up’ the gas, which encourages firing loads of pellets or BBs, which can be a waste of ammo, gas and money; but that’s the price of a fun gun/convenient CO2 power source.
If you want accuracy above all, then the HW40 is fantastic, and not expensive (around £90 used). This is a single shot PCA, slows you down so does not waste pellets and is very satisfying to place one pellet on top of the other time after time! Alternatively you could go for single shot spring powered, more powerful, but less accurate due to the recoil (HW45, Webley Tempest, Premier, Junior etc...)
The ultimate fun guns are the semi-auto CO2 BB guns (4.5mm metal or 6mm plastic), especially the blowback type like the TFW 1911, but BB guns are smoothbore and less accurate, and prone to more rebounds. Having said that, some of the long barrel BB pistols are surprisingly accurate at short range (e.g. 4" and 6" Dan Wesson). As mentioned BB gun functionality might be more faithful to the real article, but construction/type of metals and action is on the whole maybe not as good (although the Baikal is built like a brick what not). If you want accuracy forget the PPK/S (though it is a barrel of laughs to use).
Pellet shooters (even relatively low powered umerex rotary 8 shot) will work on small metal knock down targets, whereas I would not want to use steel BBs on such targets due to rebounds; so pellet shooters are arguably more versatile.
(Sorry fella, I beat you to buying the black 92fs from JaspSP5, it is very nice with wood grips. Not sure why photobucket keeps rotating my pictures...
http://i748.photobucket.com/albums/x...ps27d92577.jpg)