Willie (I'll stop calling you Shotgun!!) - There are many SIG's and a visit to the SIG site (not sure of URL) would let you familiarize with the variants available. I choose the 226 ST in 9mm - lets me carry 15+1. Same gun tho in .357 SIG or .40 as an option. A 220 would serve for .45acp and then there are some smaller variants too like 228. Take a look at what there is and then drop back with any questions.
There is a lot of talk about Sig's around here. I never looked at them as an option. Might as well look at them too. Any recommendations?