The Horrorpops, The Cramps, if you like good straight up rockabilly i suggest The Stray Cats... i usually don't go for psychobilly because its Stray Cats blended with The Misfits, both good bands but to me its sad to hear those bands rip them off....but thats just me. Perhaps you may enjoy em', good luck check em out!
So, I picked up a cd at work that was called "This is Horrorpunk" and it's part of a series. I would recommend those if you aren't sure. A pretty healthy mix of bands.
A few of my favorite songs are "Eaters of the Dead" "Be My Ghoul" "Gimmie Gimmie Your Heart" "Thats My Mom"
uhm if you look it up, you can see they are all on the same CD, but it's a good jumping point. =]