Try Morbid Opera, a Florida band who mostly did stuff in the 80s. Female fronted band, their singer just died actually. I always thought they had a unique sound, a little more raw than the average band like this. Many of these bands are just too polished and full of themselves for my taste. I think their stuff is really hard to find now though.
45 grave had some good punk/goth crossover type stuff going.
Siouxsie and Bauhaus have always been hit or miss for me, but when they are good, they're really good.
My other faves have already been named, though I wouldn't consider most of them goth other than some of the horror subject matter. Original Misfits, Samhain, Damned, Roky Erickson, TSOL, Cramps, Screaming Lord Sutch, Screaming Jay Hawkins..
Deja Voodoo an 80s band from Canada (there are a bunch of bands who later used this name) who formed Og Records had some good horror material. They were very Cramps like, but more lo-fi.
My absolute favorite though is Color Me Psycho, another 80s Canadian band who had a garage type sound. If you ever see their Pretend I'm Your Father LP snatch it up!! Tom Bagley the singer went on to form Forbidden Dimension, one of the best horror bands of all time. They are still going strong after 20 years and have a lot of 7"s and some CDs out.
I would highly suggest The Return of the Living Dead soundtrack as a good starting point. Almost every song on it is good. You get 45 Grave, TSOL, Flesheaters, Roky, Tallboys, Cramps and the Damned all on one records!