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What are the best mods these days? There is a lot of content out there on the web but its hard to tell whats really worth getting.
The HD mod for UI improvements, bug fixes and the ability to play in any resolution; and Horn of the Abyss for a mod that feels like it could be an official expansion pack and adds a lot of neat stuff including a new faction.
I concur.

One more thing to recommend is the SOD SP plugin for HD mod. It makes the game with HD mod even awesomererererer. ;)