I beleive you forgot 2 more Providence mods!
http://www.tesnexus.com/downloads/file.php?id=20734 and http://www.tesnexus.com/downloads/file.php?id=22555! Be warned, though, that Skyrim Improved is not compatable with certain Unique Landscapes mods, Onra's heightmaps (at least as far as his last version goes) or the Elsweyr Deserts of Anequina Mod! And also, the Valenwood Improved mod is in German, and both mods are made by I beleive the same exact German team!
Project Name: Skyrim Improved
Modder: Skyrim Improved Team
Setting: Cyrodiil worldspace, but using a different heightmap (not Onra's)
Scale:
Status of project: the settings looks complete, but lacks quests and NPCs in most cities and towns
Notes: Not compatible with Iliana's Elsweyr Deserts of Anequina mod, Onra's heightmaps from previous version(possible incompatabilities with Onra's upcoming heightmaps could be a possibility, too), not compatable with certain Unique Landscapes mods (especially those in the northern parts of Cyrodiil), and incompatabilities with certain other mods that takes place in Northern Cyrodiil!
Project Name: Valenwood Improved
Modder: Eldarie
Setting: Cyrodiil Worldspace
Scale:
Status of Project: Beta
Notes: May or may not be incompatible with Iliana's Elsweyr Deserts of Anequina providence mod. (Compatability with Onra's heightmaps is unknown, though!)
one more time...
Mods that create complete new exterior cells in a worldspace ( in this case the tamriel ws) at the same coordinates will never be compatible !! Even patching ( at least in the usual way) is not possible as the mod that comes first in load order will completely overwrite the other one coming next in load order (except the persistent references).