Good luck with that, TIS. I've seen Elton in concert, and he was great, but I would love to see Billy Joel. Even better to have them together.
I would suggest that the minute the tickets go on sale, you get a few people together and call, call, call. That's how my friend got her Billy Joel tickets this past summer. She had her landline and 4 cellphones redialing over and over and finally got through.