Virgin Atlantic because every dollar spent earns 1.5 miles and if you rent from Hertz or Avis every rental earns 1000 miles. VA miles are good on CO and US and they have attractive rewards on other partners. Of course there's the $90 annual fee....

Amtrak because it's a no-fee card from Chase earning one mile per dollar and the miles are transferrable to CO (you have to make a $200 Amtrak "purchase" which can be a refundable Amtrak ticket, and there's a limit of I think 20K miles per year to transfer). The Amtrak rewards themselves are outstanding too.

Virgin Atlantic often has a 50K opening bonus from BofA and Amtrak currently has a 32K opening bonus on this blog.