Can't help you with the first 2, but with the tix it depends on how big the arena is. If it only holds 12,000 to 16,000 people then usually the upper areas are better because you can see down into the cage and the cameramen don't get in the way that much. The 3 shows I have been to in vegas, I was about 25 rows from the top and they were pretty good seats. Sometimes you have to watch the screen when it hits the ground, but IMO the middle to upper seats are much better.
Hope that helps. Have fun man. The crowd energy is fucking crazy if you have never been.
"Mind on fire cause I bleed petrol, we let go so the beats can control"