I've installed the following upgrades:

Morrowind Code Patch
Morrowind Patch Project
Better Bodies
Better Heads
Beast Bodies
Better Clothes
Morrowind Visual Pack Combined
Mesh Improvements
Correct UV Rocks
Slartibartfast's Texture Fix
Bloodmoon Landscape Overhaul
Oblivion Septims
Realistic Blood
Darknut's Creature Textures
Darknut's Equipment Textures
Darknut's Dwemer Ruin textures
Telvanni Textures
Soul Gem Replacer Retex
MoonStar Crosshair

One thing that still bugs me is how ugly the trees are, especially the tops of the trees. It appears as though Vality's Bitter Coast Mod has better trees, but will it wreck any of these other mods? I'm particularly worried how it will affect the Morrowind Visual Pack Combined. If it does work, do both version 3 and version 4 work with the above listed mods?

Thanks for your help!!!!

There should be no conflicts.

No, it won't wreck anything.
I haven't seen the trees alongside the Visual Pack, but I'm sure it would look fine since both fit into the original game well.

Make a back-up of any files that might get overwritten, and simply uninstall Vality's mod if you don't like it.

I recommend version4. It makes the swamp feel more dense.

Rats!

I installed it, and it cut my frame rates by nearly half. And the vines were still those cheap-looking bright green fuzzy boa things, not the vines in his screen shots.

svcks having a POS computer.

Try http://planetelderscrolls.gamespy.com/View.php?view=Mods.Detail&id=4717