Extended Cab

Recently we have been discussing the possibility of replacing our 14 year old F-150 with something a little newer. The question is which way to go, another pickup or an econobox that would be cheap on gas??? The last time we talked about it, The Old Lady said she had been looking online at prices of new trucks. She said she found some that were going for $50,000 and at that price it would have to be an extended cab as we would be living in it!!!!!!