A really nice single stack 9 is the Beretta 92 Type M. It's an 8+1 with a Centurian's 4.25 inch barrel. Hard to find and mags are expensive. I was lucky to get mine in the 90's when you couldn't give them away. I think I paid something like $350 to a police supply dealer who had 5 or 6 in the warehouse for almost 10 years.

There is a real cult following as a carry gun on the Beretta Forum. I find it as easy to carry as my 3913/14s. With the same type safty. In fact with the extra 3/4 inch of barrel it can be used "mexican carry" butt forward on that quick trip to the corner market.