Twin Berrettas.
My little babies are a pair of KWC Berretta 92F. I have never had any problems with them, and have been using them for a couple of years now. I have two spare mags for them and they can be a bit tetchy, but hey. I converted a leather shoulder holster into a twin holster, and the spare mags go in a pouch on my belt.
TIP - if you have spare mags, get a pouch that takes the spares AND the ones from the guns. Otherwise you get mags all over the place when you walk back into the safe zone juggling two berretta mags and an M16 box mag.
I would heartily recomend the KWC berretta, its accurate enough at the ranges you will be using it over, but you got to take care of your mags, they develop leaks easily if you drop them and don't maintain them properly (I used to have 4 spare mags, now just 2). Proper maintenance on the guns is also essential. My pair have outlasted my mate's backup weapon, despite heavier usage. One gas charge will see you through 3 or 4 mags of BBs on each mag, and a bottle of gas will last you for ages (depends on how trigger-happy you are). I like them so much I often go out into a skirmish armed only with the Berrettas, which gets me funny looks from the HK boys, but I have more confirmed kills with my pistols than I have with my AEG.
Lovely weapons. Unfortunatly I have to sell them to afford the pair of 93s that I want... Thats life...
**UPDATE** Retired these in favour of my pair of Custom 93R Berrettas. Didn't have to sell them in the end, either :D