My 2 cents-
I have a 2nd and a 3rd generation Colt S/A's. Both are nice, but not as well made or accurate as my USFA .44spl. SAA. I have heard the same good reviews of new Colt S/A's, though I can not see them being any better then the USFA guns. The Turnbull case colors on the USFA's is beautiful, as is the fit and blueing. All else being equal, the USFA guns are a lot less expensive, about $925 compered to about $1300 or so. The difference in price would go a long way towards buying some nice leather and other necessities. So it really comes down to what the Colt name is worth to you. If I were you, I would go to a gun shop that carries both, and look for your self before deciding on which. There really is no bad choice between the two.
By the way, that's a nice bike. Back in the late 80's I looked at a yellow Guzzi sports model. Almost bought it, but my HD bias just runs too deep, I guess..lol
My two favorite woods carry guns shown below-
Larry