If you had all the max lvl toons you wanted, just renew, and you can take advantage of a free 80 with scroll of resurrection on each account (or free faction change, or server change)

If you wanted more than two teams of max lvl characters, you could set up 3 new accounts, RAF them to two of your existing accounts, and powerlevel as much as you can stand to 80 for 3 months. I would take advantage of RAF, and just pay for a few toons to do an account transfer if you had any achievements/mounts etc that you were proud of.