Here are the current promos with miles ...
Chase Sapphire (Bonus - 2013/12/04):
Earn 40,000 Bonus Points after you spend $3,000 in the first 3 months from account opening* - that's $500 towards airfare or hotels when you redeem through Chase Ultimate RewardsSM. Earn 5,000 additional bonus points after you add the first authorized user and make a purchase in the first 3 months from account opening. Automatically get a 7% Annual Points Dividend on all new points earned on purchases throughout the year - even points you have redeemed.
United Mileage Explorer (Bonus - 2013/12/04):
Start with 30,000 bonus miles after you spend $1,000 in the first 3 months your account is open. 5,000 additional bonus miles after your first Card purchase and adding an authorized user within 3 months of opening your account. Plus, earn 10,000 bonus miles every calendar year you spend at least $25,000 on your Card.
United Club Card - (Bonus - 2013/12/04):
$100 statement credit after your first purchase.
Go to chase.com and compare the cards for full details. The Club card will give you 1.5x per point, 2 points for every $1 on United, and will give your husband Club access if he doesn't have it (and with 1K status he will get $60 off).