I've got something of a collection myself. I think my favorite's Sgt. Kabukiman, although the first Nuke 'em High and Tromeo & Juliet are close runner-ups. I picked up Terror Firmer ages ago, and still haven't gotten around to those acres of extras they pimped- supposedly, this was the most content-packed DVD ever made up to that point. I also really dug Toxie 2, the one where he goes to Japan. It's even got a cameo from Go Nagai in it (Devilman, Cutey Honey).
There were a number of movies I bought on the name alone, and royally regretted it (damn those clever marketing types!). Fat Guy goes Nutzoid was something I wanted to see for years- even though all the stuff on the box actually happens (Fat Guy with mohawk chick, hanging from helicopter, jacking up a mailbox) it still manages to be really boring. And there's that loathsome guy with the mustache, who wears a tobacco-stained shirt that you can see his bony physique through when he stands in front of a light source. He's like a walking recessive gene.
Same with Teenage Catgirls in Heat- nothing can live up to that title.