What's the best camera for someone who wants to take up photography as a hobby?

So, I want to get into photography, as the question implies, and so I want to know what camera would be a good idea for me to start at. Some guidelines:

-I’m quite poor, at least for the moment, so something that isn’t ludicrously expensive would be good.
-Along the same lines, I am just starting, so a bunch of things like interchangeable lenses and generally ultra-changeable stuff just wouldn’t be useful and would probably just confuse me. I want something I can change, if I get better, but will take care of itself for the time being.
-An instant shutter. That’s one thing I need. Most digital cameras take a few seconds to snap a shot, I’ve noticed, and I like impromptu shots so I need a fast shutter speed. If this is only in film cameras, so be it, I can deal with film.

So, any ideas from the collective? If I can’t find something good enough in my price range, that’s okay too; let me know what I should look for. I can start saving, but something in the low hundreds would be best. Thanks in advance!