Another that is starting to get some fans is FlashFXP. The people behind it say "FlashFXP offers the easiest and fastest way to transfer any file using FTP, providing an exceptionally stable and robust program that you can always count on to get your job done quickly and efficiently."
FlashFXP is loaded with features. Here is a link to some of those features
iniCom.Networks - FlashFXP Features
You may purchase FlashFXP or get the free trial.
Here is a link to FlashFXP so you can see if it is of interest to you
iniCom.Networks - FlashFXP