Thanks, all! FYI, this is for my impending Zorki-based fake "Leica Standard"...my other current option, besides a collapsible 50, is to get a super tiny 28, like the Winogrand Canon or the CV Skopar. (One advantage of going for an I-22 would be that I could buy the 28 as well.) This will be pretty exclusively a sunny-16 street camera, with an accessory finder for quick framing...a 28 would be much easier to keep in focus, but you can't have a fake standard without a collapsible 50!
wlewisii, thanks, I've bookmarked those auctions!