hmm...I'm sry ,i'm not able to recommend a product...
you have to try some products by yaself:
http://www.sofotex.com/download/FTP_...e/Ftp_Servers/
http://www.zdnetindia.com/downloads/...sc,60,219.html
@Lansing_Banda : it's no problem to setup an apache with a dynamic dns...as long as you don't want to use "Virtual Hosts".