Upload & Sell: Off
I agree with Caleb, these are not that bad
This guy clearly knows what he is talking about.
I remember the days when ISO 1600+ was hardly an option and if there was that option it was ISO 3200 as a hard ceiling. I used to dream of ISO 3200+. Seems these days I shoot to my equipment and don't venture out at night. (reverse vampire?)
I'm not super familiar with LR noise reduction, but I have used a couple of different plugins for Photoshop. From a work flow side I would reccomend doing a bit less NR on web images if you are working with those (such as LR only) and if you are printing up pictures for clients go ahead and run the original fine (with no NR) through a dedicated plugin such as Noise Ninja or Noiseware Pro, etc. My experience has always been positive with NWP, but other users (as you can see here) swear by Noise Ninja.