Well...
Busters on the Planet (2001) - Long, fairly varied setlist. Very high energy, though a bit sloppy in places. Shot with DV cams at 30fps. Good stuff.
916 - ZOMG 15th Anibasuri I RIKE YOUZ busters, ok? (2004) - Long setlist. Some older songs we don't see much of. Shot professionally in widescreen movie-style at 24fps. Better sound and video quality than BotP, but a little weak on the enthusiasm front. (it was the last show on a long tour) Plus Jun's bass is a little grating on some pre-1999 tracks.
Bubble Town's Happy Zoo (1998) - Classic. Only downside is the fake film effects and short setlist, but it has Sariban ni Naritai
The other DVDs, We Have a Theme Song and Dead Stock Paradise are just PV compilations, while Bump Tour in USA is 30 second clips of FLCL songs being played in small clubs
I highly recommend BTHZ, BotP, and 916.