Total Conversion Mods

Was wondering if anyone's tried out the various total conversion mods out there and if you'd recommend any in particular. The only one I've tried has been Classic Adventures, which wasn't perfect but was pretty fantastic nonetheless. Any other gems worth checking out?

Here are the ones I've found but not tried

http://modlist.pocketplane.net/index.php?ax=list&cat_id=10

http://www.teambg.org/elhoe/LOTR_index.html

http://www.gibberlings3.net/shadowhand/