Searching on Nexus, I see quite a few LOD mods; wondering which ones people here prefer? Specifically looking to fix:

Waterfalls
Trees
Buildings - esp with Hearthfire; I've noticed that the Hearthfire houses only pop into view when you're relatively close, worse than a lot of other structures

Compatibility with all DLCs preferable.

If multiple mods are needed for the various improvements, which ones play nicest together?

You will never get distant LOD with your Hearthfires house.

Object LOD has to be generated with the CK.

Even if you save after making a new abode, the information is not saved in an esp, only in your save file (I think).

IIRC, extending the tree range can be done via an ini tweak. I believe it's in your Skyrim Prefs folder where your save games are located. I think this is what you'd be looking for: fTreeLoadDistance. It should help some.

http://www.nexusmods.com/skyrim/mods/40564/?

Can't help you with the rest, sorry.