The G36 was my first Glock, it's on my hip right now. I also have a G32, and will probably get a 30 and maybe even a 26 eventually. I started with SIGs, and I still love them, and if I'm just going shooting for the fun of it, nothing beats a 1911. But when it comes to concealed carry, for me nothing beats a Glock. My Kahr K40 comes close, but I haven't had the time to get 100% comfortable with the long trigger pull.
I don't regret getting the 36, but the 30 does have some obvious advantages: 4 more rounds in the magazine, and if you are a little paranoid or like to be extra prepared, the G21 15 round magazines will work with the 30, so you can carry a "big stick" for backup should your initial 10+1 not be enough...
As far as small platform .45's go, I've owned a Beretta Mini-Cougar 8045, a Kimber Eclipse Ultra, and I've fired a SIG P245. All great guns, but I find the G36 the easiest to live with day to day -- for carry, anyway.