After a shoot I put the NEF files in LR4. The ones I want to convert are then exported as NEF files into a "New Project" in DxO. I generally use their "Default Preset" and make adjustments as needed. Since I usually don't make any further corrections in LR4, the images are processed and exported as 100% JPEGs to LR4. I then select the JPEG's I like and upload them to my SmugMug account.
I have been using DxO since Version 3 and they are now at Version 7.5. Their last update which includes modules for the D800 was released a few weeks ago. They are still working on the D800e modules. You might want to check your lenses against available modules, before you buy the software. You obviously can still use the software without the automatic corrections, but then I don't see much advantage when compared to LR.