Doug,
I have two APS cameras, a Minolta Vectis 200 and a Yashica Profile 4000ix Zoom. They aren't rangefinders but they're good cameras nonetheless. Frankly, I like them both because they are easy to carry and small enough to throw into a pants or jacket pocket. The Minolta I got shortly after college and took everywhere with me. Granted, you're not going to get the fastest lenses in the world but for a carry-along camera, they do just fine. I'm much more likely to carry a smaller camera than a larger one even if I do sacrifice somewhat in negative size, although there really isn't that much difference in size between APS and 35mm half-frame. Overall, prints from my APS cameras have been better, or at least more consistent, than prints from my 35mm cameras simply because of the magnetic strip passing exposure information to the processor. You're also going to find less ability to manually control the camera settings since most APS cameras were designed with the non-serious photographer in mind. Don't buy into the snobbishness you'll see on photo.net; it's another film format like any other. Can you tell I like my APS cameras? I just think they're a blast to shoot with and let's face it - if it's a good image, who cares what you got it with?
Stu, you may want to consider ordering APS film online, there are print films available from Fuji and Kodak in ISO 100, 200, and 400, all of which seem to be easily available here in the US. I also thought I saw a Kodak ISO 800 film when I was in Target the other day, I'll have to go back and check. No slide film that I am aware of or have been able to find, though I remember hearing about it once. I've heard great things about Kodak's new High Definition APS film (also in 35mm), I'll let you know soon what I think of it. Buy in the three-pack; it's cheaper that way.
Doug K.