Wow!
You are SO lucky to come across so many machines at those stores, and to be able to actually GO out to look. I've resorted to ebay for most of my latest purchases because my parents are usually too busy plus I cannot drive on my own yet. The Elite's, Whirlwind's and Windtunnel's aren't really collectable yet (too new, and common) but that Convertible and model 28 certainly are. I hope you find whatever you are looking for. If your interests are anything like mine was a couple of years ago, I'm sure the "vintage" models will eventually grow on you, like it did for me, especially as they get harder to find.