Damsels and clowns are in the same family. I had a Blue Devil and a four stripe that I returned to the LFS. I still have two clowns. The thing is, if you are getting a huge tank, they may stay in one small area and not move to the front. Imo, smaller tanks are best for interactivity!
By clownfish, I assume you're referring to ocellaris or percula? (Nemo) I've never kept damsels, but I do have a percula in my tank, and I can sit there all day watching him play in the anemone. I wouldn't say he has a huge personality, but he's definitely intriguing to watch.
For personality, fish like the lawnmower blenny and flame hawk have heaps of personality. Very inquisitive little fish!