Best raw converter for the D800 is...

There are so many ways to tweak the images from within DxO with that plugin enabled.  You can really give your images some character that I have been unable to recreate in Lightroom.

Alienskin Exposure 4 is a great plugin, but it's not applying the data to the raw file and is really a two step solution with it's own complications.

Of course, there are presets you can buy for Lightroom like VSCO, but they are expensive and I haven't seen results that I like.

Lastly, DxO's neutral profiles are color accurate (without having to use an Xrite colorchecker)