Here is where I am at the moment:
For .45 - I think something like a Colt CCO or Nighthawk T3 would be something that I would like to have. Officers sized frame with a Commander sized slide. I am not sold on the sub 4" barrels on the 1911 design.
For 9mm - besides the Rohrbaugh, I think you are going to have to go with something like the Kahr PM9, Glock 26, H&K p2000sk, XD9SC, etc. The size can not be compared to the Rohrbaugh, but they may be a little easier to carry than some of the other compact guns.
For .380 - Seecamp, of course. Ruger LCP, Rohrbaugh 380, Keltec P3AT, Kahr P380. NAA 380
I am sure there are more, but those are the ones that I have noticed and stand out to me.
Thanks for the continued discussion