nvhunter, I have been every year since they started cup races their. In my opinion, you want to sit somewhere in the main grandstand (sections 1 - 3). In NASCAR, which is different than most other sports, the higher you go, the more expensive the tickets. We buy the 3 day pass in the red section of section 1. This puts us down close to the track at the end of pit road right by the entrance to turn 1. We are still able to see pretty much the entire track even sitting down in the red section. We have sat in all 4 sections but we prefer section 1 just because of what we can see. Section 4 was our least favorite because we couldn't see the action on pit road. We also like being closer to the track. We can actually feel pieces of the tires hitting us once in a while as the cars go by. Bobcat was right, there will probably be close to 150,000 people at the race this year, so if you don't like crowds you may want to stay home.
You should definitely go to the race, especially if you have never been. There is nothing like being there live. TV doesn't do the speed, sound and especially smells, justice. And the best thing about the race, other than the race itself, people watching.