I switch between the P3AT (.380acp) and the glock27 (40s&w) depending on the clothing I wear. I prefer the 40 cal but sometimes it just prints to much and I just put a .380 in my pocket instead. Thats one of the reasons why I love winter months better! I might just be weird I guess but I don't have a problem with snow I love it and drive a 4x4 truck anyway ^_^
S&W model 66 2 1/2 incher .357 or a G19 9MM depending on my mood. I like my G19 so much I'm starting to look for a G23 for a little extra oomph. I'd almost trade my 26 for one.
I usually carry .40 but that is because my carry gun is a Glock 22. That is my primary carry gun because I very much like the way it shoots and I consider totally reliable. When I don't want to carry a full sized gun I carry a Kel-Tec PF9. So caliber isn't the issue with me. I carry the gun that suits my needs.
.40 Baby Desert Eagle in nickel. That tucked and sometimes my small backup .380 in a Desantis ankle holster. I really like the idea of an ankle rig and its not so uncomfortable its just annoying as hell and cant really get used to a lugged down foot.