Harpgirl hit the key issue there (IMO). A number of cheap banjos can sound and feel pretty good, but keepin' 'em tuned (especially in a group) is a bear. Here's been my experience with entry-level banjos (relative to keeping them in tune only...)

Goldtone - not good
Deering - good
Saga - good
Old beat up no-name that felt great in the shop - infuriating

I recommend the plastic ones (horrors!) if your gonna be taking it travelling.