If you're not racing then I can't see why you would bother getting a new bike. You won't be any faster, you will be a lot poorer, you will have to make it up to your wife in one way or another. Upgrade the wheels to something really aero and you will be way ahead of the game. Or if you want positive feedback and lots of attention then buy a steel frame classic and you will get more comments and admiration than you will ever get from a CF bike.