I live in Vegas and will try to be at the show both days. It's my favorite event period here. Maybe we can even meet up, whichever (or both) days I'm there, I always head for the far far left side of the crowd. Center crowd is a disaster, I suggest staying away, and the show is just as good at the far ends. So you may see me far far left and against the metal crowd barriers. I'll have two bodies, one with the 70-200 2.8L and another with the 300mm 2.8L. The later should be dead-obvious and on my right side or pointed at the sky. I'll have a dark green chair with me. Send me a private message if you are interested in meeting up.
I have shot this show the past two years with a mark III. The first was only with the 24-105L, the second with 70-200L. I have not changed either of the settings that you asked about from the default. I found that I was very, very pleased! So I guess my answer is experiment, but also don't be afraid of the defaults for those specific settings.
As for which focus point, I have found that I go with one of the points towards the side of the frame that the aircraft is moving. Usually one of the inners, occasionally one of the outers. If you get sick and tired of flipping them, go center.
Don't forget your metering modes! From experimentation, I have found that spot mode, ALSO linked to the focus point, works best for me. Note that I shoot in raw.
Other than that I shoot in Tv, 1/250 for propeller aircraft, 1/125 but no slower for helicopters, 1/1200 or higher for fast aircraft, and 1/2000 or even 1/4000 for the fastest and closest passes.
Make sure your ISO safety shift is enabled (I am not near the cam, I forget where the setting is at). This saved a number of shots for me.
You may also wish to ponder your storage options. Any other time, I write to both. I stupidly did that last year with an 8GB CF and 8GB SDHC and hated life pretty fast. Got back in the game by blowing out one card and then having it write to the other, but I still ran out. Gotta love hard lessons. This year I rented another mark III body along with a 32GB CF and 16GB SD (and the 300mm mentioned). Both bodies will be set to auto-switch, that is to say, write to one card till its full then switch to the other. The 300mm setup will see the majority of the abuse (yay rentals).
I'll throw in any other thoughts I have if I think of any. Again, contact me via private message if you are interested in meeting up at the show.
1D Mark III (1.2.3) || 24-105L f/4 IS || 70-200L f/2.8 IS || SpeedLite 580 EX II || Gitzo GT2541 + G1278M ball || Some Heliopan filters || Lowepro SlingShot 200 AW || Some other jazz