And based on the track layout and elevation changes, the new Kyalami still gets my vote.
See for yourself.
Ultima GTR at Phakisa Raceway (long road course, 2.636 miles, roughly 1:51 lap time=85.5mph average)
http://www.youtube.com/watch?v=H6RqHx7VyUo
1992 McLaren/Honda (Ayrton Senna) at Kyalami (and as of 2009, they took the chicane back out of the penultimate corner at Kyalami, 2.648-mile lap)
http://www.youtube.com/watch?v=Xv8zzLVRF9g
Hey, don't get me wrong, I'm glad somebody is trying this again for sportscars, but I don't know if it's the right group of people to get it done, and to me, it definitely looks like the wrong track in South Africa to be doing this. I mean, I'm not sure how many places there are at Phakisa where the LMP2s would be able to get by GTs, and at a number of spots, I think it would take some real aggression to even squeeze through traffic in an LMP1.
EDIT: Mike, we'll just have to see. Even if they do add the banking at that end, I don't know how much that will help. Also, the FIA might want a chicane in there somewhere for the LM cars, which could well make it a moot point as far as adding a long, high-speed section to the road course.
It isn't what it was, but Kyalami is still a quick circuit, with great elevation changes, and at roughly 6,000ft, creates a number of altitude-related complications for racing teams; I wish F1 still had a truly high-altitude circuit on its calendar.