Well, the two I've "always wanted to see" and finally got to are the Eagles and Jimmy Buffett. The Eagles put on a great show - for pure music, I'd rate it as my favorite. Buffett was a great show too, but just as cool is the experience - go early and hang out with the Parrotheads, it's something to see, and a whole lot of fun. Last spring in Frisco, TX was my first Buffett show, prob'ly won't be my last though.
Now my "gotta see" concert is Cross Canadian Ragweed - I know they play alot of shows, many of them not too far away from here, but it just never seems to work out. I'll make it one of these days, though.
The one that's gone that I really wish I could've seen is Stevie Ray Vaughan...