Angie and myself are definately going next year.
This year we were camping in Beausejour campsite.(Infield, near Porsche Curves) As we didn't arrive until Friday morning, we were near the back of the campsite, but this worked out well for us. The ground was flatter there (good for the tent) and after 2am it was fairly quiet, so we managed to get a little sleep! There was also a free shuttle bus which took us near the pits. Bus leaves every 15mins.
I'm willing to try Houx Annexe, but I need someone to confirm that the ground there is ok for camping in a tent. Some of the "campsites" looked like the tents were just pitched on gravel!
Need to book up fairly soon, so if someone can tell me Houx is ok, I'd appreciate it.