I am really excited with the offer and I am looking forward to starting soon. But as you know, my wife cares about my career too. If you don't mind, I would like to consult her tonight and get back to you by such and such date. (don't make it too long).

一般EMPLOYER尊重FAMILY中两人一起做决定. 但是你拖延, 总有RISK这个OFFER给别人.

别想太多, 在OFFER和被OFFER之间, 是有平等的需求关系存在的. 如果他们不认为你合适, 也不会因为你"需要这个OFFER"而给你OFFER的.