Black Widow's are so beautiful. I love the shiny black carapace and how the legs go into a sharp point. Oh, and gotta mention that tell-tale ominous red hourglass.
These spiders look demonic, though:
http://www.rochedalss.qld.edu.au/spider/purseweb.htm (worksafe link)
I may like them but if one jumps on me I still freak out and get the jeebies.