Old(ish) analog Tektronix scopes are good... something in the 60MHz range. They can be had for decent prices if you keep an eye out. They are pretty big though.
I really like my portable digital scope (Owon PDS5022S), though if I was to buy one now, I'd probably get something like the Rigol DS1052E. This one is especially cool because it can be hacked to run at higher speeds. The thing I like about my Owon though is the built-in battery pack option. I use the scope WAY more because of it than I would if I actually had to plug it in to use.
If you want something really portable (like the one you posted but fast enough to be useful), they're available, but quite a bit more expensive.
DogP