About the Mosquito, I'd look around for a Ruger MarkII or MarkIII or maybe even a Browning Buckmark before I bought a Mosquito. Personally, unless I can get a Mosquito for cheap then I'm going to look at a Buckmark Hunter.
Everything I've read says that when they are working the Mosquito is great but it is almost literally a crapshoot as far as reliability goes. Sig does back up their product though and you can count on great customer service.