I like the carbon because they are very responsive but not as stiff as plastic. The full foot Avanti is not a short fin they are several inches longer than my Nova's and only 3" or 4" shorter than my Omer fins. My opinion if you are going strictly by price you may not be happy in the end. I would see if you could borrow some fins that others are using and see what you like.I can't find any reason within me to convince myself to get carbon fins, I know they are sweet as hell to use but the price just doesn't seem to fit the number of use I will have on it. I know the Avanti fins are very nice but I don't want to have another short fin on my dive bag.