I have a couple fav Windows file managers: Total Commander, Powerdesk, and Magellan Explorer. I like them all for different reasons. I especially like having a dual pane.
I checked out some screenshots of the XFE file manager for Linux. In installed it, but no icon showed up on any of the menus or on the desktop, so I can't even find the thing to try it out. I think it might be because that one's not well suited for Ubuntu. If you have a fav file manager, I'd like to know which one it is.
Btw, I'm delighted there's a version of Opera for Linux. It's my favorite browser.