For Amex, the 100k Platinum and 75k Gold are both good options if you have been targeted or want to try calling after to bump your bonus up. Gold often gets the annual fee waived and you can get $400 of the $450 fee back from the Platinum card back in airline purchases (e.g. Gift cards).

I would consider also doing the SPG card(s) as the bonus is probably as good as it gets. It is also a good daily use card since the StarPoints are often worth a bit more than 1 mile via transfer bonuses.