I might be getting a silver dollar pancake for Christmas and I'm looking forward to trying it, but I can say with certainty that The Answer from Tucker Gunleather is the absolute best tuckable IWB holster I've used with my 1911. The have a version of that for the SP and smaller models as well. Google them and see what they offer.
But again, I'm really looking forward to trying out the SDP from Simply Rugged, too.