BMANN06, looks like you've started to travel quite a bit. Keep inm ind that you may get an invitation from your E35K as well as the E50K (unless they came in quick succession. You will also get new invites if/when you hit E75K and SE100K provided you reach them by mid-October.

Grab all the Eupgrades you can and then select bonus miles when you think you've maxed out.

Others can probably give you better info on what AC grabs back and what they let you keep as you progress up the levels.