i want a P227 and can't decide which.  Help me pic it out.  Here is my list of what I would like to have:

1913 rail - I don't think the P227 has a model with a 1913 rail
SRT and Short Trigger - Not a deal breaker because I can add this later but it would be nice to have.  If the gun doesn't come with it I will add these two items.
I want it to utilize my existing P226 holsters
I would like to have as small a grip circumference as possible but I think they all come with the E2 grip
As durable a finish as possible (I think the Nitron is tougher than the cerakote but I am not sure)
Which gun should I be looking at?

I went with Nitron

Added some Trijicon HD sights and a Surefire X300U

I just bought the FDE Cerakote model.

Get on Sig's mailing list, if you aren't already.  They run periodic sales on some modification and maintenance stuff if you don't want to/can't do.

The TACOPs without question.