I've read (although I don't KNOW this to be a fact) that one reason the Colt SAAs in .41 Colt are relatively scarce is because many of them were converted over to .38 WCF back in the day.
Considering having a USFA SAA with Dual Cylinders has its appeal, however having one that shoots a cartridge that's less "desireable" (now, as it was back then) seems to me to be questionable (although the rarity is guaranteed).
Of course if you just "have to have" a real challenge, well I've been guilty of that myself.