Ring and Pinion Gears

I have a 1991 Mustang GT Convertible (little slower but there's nothing like cruising with the top down). It came with the optional 3.08 gears. I want to upgrade it to the 3.55 gears. I want the 3:55's because they give you more acceleration but don't guzzle the gas as much as the 3:73's and up (I drive on the highway a lot). Will the difference in acceleration be worth the money? Does anyone recommend these? Not like them? Any input would be appreciated. Thanx.

PERSONALLY I WOULD GO WITH 3.73'S , THE DIFFERENCE ISN'T REALLY NOTICABLE IN FUEL MILEAGE BUT THE POWER IS MUCH BETTER