Well Better Heads is replacer for heads you can find in vanilla game. It replaces the ones that exist there and does not add any new. World of Faces, and Facepack Compilation (I suppose you mean http://www.nexusmods.com/morrowind/mods/14435/?, I cound not find anything called just Face Compilation) adds new faces to NPCs. I do not know whether they also replace the orginal heads. There will also probably be some conflict between World of Faces and Facepack compilation. But in theory you should have no problem running them all together if you like them.
Concerning load order I suggest first either World of Faces or Facepack Compilation, depending on which faces you like more. If you prefer World of Faces, then load Facepack Compilation first, then World of Faces, and finally load Better Heads.
If you like you can also check similar mods like World of Faces. For example, I like http://mw.modhistory.com/download-56-3258.
Concerning mods that replace vanilla heads (i.e. mods similar to Better Heads) there is plenty to choose from and they mostly depend on your taste. The ones I consider most popular today are:
MacKom's heads - probably most detailed and realistic, but very different from vanilla look and they would not look very nice together with new unique faces IMO
Westly's Pluginless head replacer - detailed and faithful to vanilla. There is also Westly's Master Headpack, which contains A LOT of heads for player to choose from when creating new character.
Better Heads - you probably know this one since you are using it. There is also addon that makes NPCs look at you with their eyes for this mod. Check abot's morrowind world videos on youtube to see the effect
Vvardenfell Visages - a bit different from vanilla look, but still blend nice into the game. I personally use this one.
You can find all of these mods either on Morrowind Modding History or on TES Nexus.
I hope this will help