For those considering the Citi Prestige:

Buying Delta e-gifts does count toward the $200 annual airline fee reimbursement. Annual as in $200 in 2013 and $200 in $2014.

If you already have Global Entry, a Prestige AU's Global Entry fee can be reimbursed for $100.

If you are CitiGold, the fee for the card and for the AU card is reduced.

The Airport Angel lounges are mainly outside the US, but many have free beer and hard liquor and food (been to 3 already).

I'll post more as I play with this toy.