if we are talking less than 2 evils. if you go to the health food store they sell coconut 'ice cream' by a company called SO, that atleast isn't dairy ... it is 90 calories per sandwich. you will live and you can get away with it once a week i suppose
what bothers me though about your post is that you said "i love ice cream and will go into a diet soon" with that attitude you will fail at weight loss or lose some weight then gain it back. you need to change your lifestyle