Dali is another one that you if I remember correctly you really need to be careful what you're buying and research it ahead of time. I don't remember the real specifics involved, I just remember there was something about them that you had to watch out for. Ironically, it was actually a Princess Fine Arts person that brought this up at one point. Basically, I'd recommend a lot of research before buying something from Dali to make sure you're actually getting what you think you are. Of course, the problems around Dali stuff has actually made them relatively affordable compared to where they probably should be. (Of course, that also makes a case for why investing in art expecting the values to go up can be a dangerous thing.)