I agree about the Dixie Chicks. They'll be around for a while, so you'll see them eventually.

As far as Jimmy and James go, I've seen both [James most recently last year], and I can see how you're having a hard time to decide. Instead of getting all technical and weighing the pros and cons...it's simple--

Flip a coin.

Sorry if I haven't been of any help, but Jimmy and James are both fabulous performers. Good luck with whoever you choose!