Those Sigs are some really neat shooters. I sold my last real Sig a few years ago and have an empty feeling where my p220 used to be (as well as p226 p229 p239) now the only Sig in the household is my wife's p238.
I've got a Sig P220 Combat with Streamlight TRL-4 in the same role. It has a 10 round extended and 8 round flush magazine. Probably the best shooter I have (other than my Model 19). I wanted a S&W M&P45, but the CA "approved roster" got in the way. I did swap the standard grips for Hogue grips.