My guess:
Invites February 29th
Event March 7th
Release 5pm March 16th with these models:
$399 iPad 2 16GB
$499 iPad 3 16GB
$599 iPad 3 32 GB
$699 iPad 3 64 GB
Along with the +$130 for 4G models (but not for the iPad 2).
I'm on board with every one of your guesses. I really really want Apple to double storage so that the base is 32gb but I'm doubtful. I also want a 9am launch but I'm also doubtful on that one. 4 days til the invite!