i voted for the 3-4 track.
I dont see any good point in the Nardo Track, id much rather see Ehra-Lessien.
Some other interesting information about Ehra-Lessien:
The heavy white outline around the whole facility is sand (at least 24 feet wide or wider in some places) that is graded perfectly smooth so they can see any footprints (i.e. intruders, spys, etc.,etc.). The sand has two razor wire fences on either side of it that looks similar to what was up at the border between east and west Germany at one time. There is also a security service road that is patrolled all day.
Within the facility you'll see a 4 mile stretch of three lane (each direction) track with dogbone loops on each end that are banked (you can drive at roughly 120mph on the banking and let go of the steering wheel and the car goes straight). This is their high speed test loop where they have wrung out the Veyron and other cars.
There is another much smaller high speed test loop that has a small pond and a vast area of asphalt for a variety of tests. The brake testing area is here where they have differnet surfaces used for adhesion/ABS testing. This smaller high-speed ring has a smooth lane and two increasingly rougher surface lanes (to the point that you would question your life at 120mph+ going over the rough equivalent of speed bumps that are staggered left-right).
At the south end is the main entrance and R&D facilities. This is also where the "torture" track is located. Here cars are subjected to god awful surfaces, potholes, bumps, inclines, heavy braking, small jumps, a water crossing (yes they drive the car through at both high and low speed in about 6 inches of water) and more. I was told the test drivers are not allowed to drive the torture track for more than 15 minutes at a time due to fatigue.
The north end has a number of meandering roads that have a variety of surfaces, camber of turns, banking of turns and, although you can't see it, up to 75 feet of elevation climbs where they will strap a large load of weight both inside the car and on a trailer behind the car to do load testing.