i've used 3 ftps' and i'll say that filezilla is the best. I've used wsftp and did not like it at all, used cuteftp but that wasn't free and only had the evaluation. also used bison, so i guess that's 4.
filezilla is JUST like cuteftp. it is very friendly and very nice. very easy to use.
http://sourceforge.net/projects/filezilla/