If you can find a Ruger Mark II got for it. Although the euro mag release is a pain, it's not like its a combat gun anyway and the Mark III is comprable to the Colt series 70 to series 80 transition, totally stupid trigger downgrade.
A lot of people may disagree since there are negative posts out there but I love my Sig Sauer Mosquito. Provided you use good quality ammo like cci mini-mags and keep it clean and oiled it functions perfectly.
I've seen several posts regarding the Phoenix Arms .22, and I'll have to add a +1 for those. I've run 2500 or so rounds through mine with no issues, and my wife has one that has 10,000 plus through it, with no problems. I got mine for around a $100 new, and as long as you keep em clean, they are good to go. Great back-up gun/deep concealment. I've always been a Ruger fan, and own a MKII but I always grab the Phoenix when I head to the range.