kayaker:
I would not trade my Robar R9 for your Special Forces model; forget about the extra cash. There is no right and wrong answer here. However, if you go through the trouble of acquiring a Robar R9S, one of two things will happen:
1. (If you find one in stock) you will pay a price not too far removed from list price of Special Forces model.
2. (If you order one or send your R9 directly ro Robar) you will face a long leadtime, like Yankee 2500 (John) did.
In any event you will end up with a one tone (silver) gun. I was fortunate enough to purchase mine with carbon fiber grips and, for me, it is the sin quo non of Rohrbaughs.