blue,
This is not an "I told you so" by any means, but I have been saying ever since my revolver experience at Gunsite, and even before that, a revolver isn't that great of a fighting gun. As you obviously were able to visualize yourself in that situation, you must have begun to think that way too.
So if I may rant for a moment. We have been fed the cliche, "The first rule of a gunfight is to have a gun" for so long we no longer think that the gun or type of gun matters. It does matter, and I think you are very wise to reconsider what you carry. I coined an expression long ago that goes, "If you're in a gunfight, how light the gun is for convience of carry and how easy it is to conceal doesn't matter in the least; only bullets and hits count."
I just read a story of an off duty police officer that was in a fast food store when an armed robbery occurred. The BG, with his gun in hand, ran toward the officer and the officer fired 11 times and reloaded before he approached the BG. Most of his 11 shots hit.
We seem to believe we can do much better than this officer because we've all heard, "If I can't get it done with five, I'm in deep **** anyway." Well, here's yet another example of five not working; it took 11, and if IIRC, 9 were hits. If this officer had been carrying his lightweight revolver he would have run out of ammo, and I feel certain he would not have had time or opportunity to reload. A hi cap semi may have been pivotal in saving this officer's life. Rant off.
In the situation you reported, there were two BGs. Had you been in the store, you would have had five shots, right? For two armed BGs?