The one I use for years and years now, something I cannot live without anymore: Directory Opus. You can costumize everything. It works with ftp. Moving files has its own transfer system which is faster then windows. It has one folder tree and 2 folder screens next to eachother, each with tabs. I've tried several file browsers, but this one is by far the very best. It took the best from all file browsers and combines them. As options, so you may have a totally different one as to I have, fit to preference.
Edit: a free alternative is Total Commander. 2 windows, tabs, just no folder tree.