Sigs are great guns. I have both a P226 and a P228. Like others have said the 228 (or 229) is slighty easier to conceal. You'll be down 2 rds, if that makes a difference. If you are going to CC IWB the extra length of the 226 barrel won't really matter.
... and a .22 conversion barrel, .22 mag, and you're a total 4 caliber shooter!! Right now I'm sticking to .40 and .22 in my 229... and waiting for that STEAL of a deal to come along on another barrel.
Additions or corrections, folks?