I did some more reading about USB scopes, and particularly the one from Parallax got good reviews, and I suppose it's a lot of performance for the price, but it's still pretty darn slow (you can't look at USB signals in real time with a USB scope after all). I also came to the conclusion that I really wanted something with its own buttons and knobs rather than something I had to mouse click and drag.
That Owon scope Jan found does look pretty nice (especially the color screen), and I was hoping for something with that compact LCD form factor (not one of those old CRT dinosaurs) but the bandwidth is still just a smidge low. It would probably be just fine for anything I would ever do with it, then again I'm not so sure that just four samples make for a great reading.
Forgoing the color screen I decided to go with the brand-name sure thing, the Tektronix TDS 210, aka the single most common oscilloscope on e-bay (~$500, +/- $100). It's got 2 channels (the third BNC post is for an external trigger), 60 MHz bandwidth, and takes 1gs/S. It has all sorts of automatic ranging, measurements, math functions, self testing, and an expansion slot for things like a printer port (yes, it has a 'hardcopy' button). A friend of mine has one and loves it, so I took the plunge:
I've been playing with it a bunch this afternoon, and I'm really pleased with it, plus I'm surprised at how intuitive it is. The only odd thing I've found so far is that when you're in the cursor menu you use the level knobs for channel 1 and channel 2 to move the cursors. Once you realize that, it's actually nicer than using a single jog switch to move one cursor at a time. It took me forever to figure out though, even on the fancier (4 input, 100MHz, 2Gs/s, color screen) TDS 2024 scope I use at work, and that one even has little LEDs that light up under the knobs when you enter the cursor menu.
The one thing I wish this had was a way to save images of the screen at the press of a button (the TDS 2024 at work has a CF card slot for this, and the older but still very nice dinosaur CRT TDS 540 has a floppy drive). This guy doesn't seem to have any expansion modules for that, one has a serial port though, oh well. All in all though this looks like a great beginner/intermediate oscilloscope to me.