In my (admittedly inexperienced) viewpoint, the most important thing is to have a gun. Just that puts you way ahead of the curve, and anything that shoots is adequate. Second most important is to have a gun that you're comfortable with, so if the SHTF and you get that cold shot of urine straight to the heart, your situation isn't complicated by an unfamiliar tool.
Sounds like your Blackhawk meets those criteria.
All that being said, I personally would rather have and be familiar with a bottom feeder. Yes, almost all gunfights end in fewer than five rounds - but no one's ever lost a gunfight because he had too much ammo. The "you're almost certain to never need more than five rounds" logic sounds suspiciously like "you're almost certain to never need a gun" logic, to me. I don't like that "almost" in there at all.
As for the idea that the BG will be intimidated by a SA, because he'll have to assume you know how to use it...I think that's giving more intellectual credit to your average street thug than he deserves. Any intimidation you're going to achieve is going to be because he never expected to be on that end of a gun.
Of course, I'm not an expert of any stripe, and my opinion is worth exactly what you've paid for it.