Taco dip is always fun and lots of people like it. Bonus points for layering it pretty. We use a pizza pan and do a layer of refried beans, then guacamole, then lettuce, tomatoes, olives, and cheese. There could be meat or sour cream in there, all depends on what you like.
Any taco dip is good, everybody likes it. The layering only takes a little bit of time and a steady knife hand as you spread the saucy layers around, and leaves you with a much prettier presentation, if you think that would be cool for the party.