auto to 5spd conversion question

i am thinking of buying another duster and converting it to a 5spd from an auto. i know this has probably been talked about before. i have an option to buy an auto car and swap it to a 5spd. or get a 4spd car and swap it to a spd. the auto car is cheaper by half the price. i already have a new 600 tremec from a torino project that i am going to get rid of,so the big expense is done. need opinions!