Lastly, just fuel the flamewar, I am a proponent of digital scopes.
I've got a 100 MHz 2-channel Fluke Combiscope - how do your feel about those?
If you are willing to buy used, I would only buy it if it came from a reputable dealer, or I could test it myself. Get yourself a pair of 100 MHz probes, and if you are able to test it yourself, hook up to the test signal on the scope and run it thru the simple "paces"; check alignment, focus (see if you can adjust them), etc. Generally, if it passes the self-test good, its probably OK.
I've bought two used scopes this year; one was a Tek 2213 60 MHz scope (like retrolefty
's) - I had to buy a new implosion shield from a guy in Czechoslovakia; it was fogged from some chemical spray - but other than that, perfect (he had it serviced and calibrated by Tek - gave me all the documentation for it, too). I bought it off a guy on Craigslist for $150.00. Later I picked up a rolling stand for it off a gal on the ElectroTech forums for $25.00.
A few months back I picked up the Fluke - its a combination analog and digital storage scope (hence the name "Combiscope"); it was calibrated as well. I picked it up at Apache Reclamation here in Phoenix; paid $200.00 for it.
Both are great scopes; I wouldn't jump into the first thing I saw, unless it was a great deal (both the Tek and Fluke I got were pretty good deals - though had I saved my money, I could've gotten a 50 MHz Rigol DSO or something).