I haven't made a decision yet. I usually attend the practice day on Friday. You get to roam the suppliers tents with a smaller crowd. You can sit any where and watch. I watch some from the curves on the infield and then a little from the main grandstand (finish line). They aren't racing but I am there for the reverb of the sound. I have been to race day twice it is cool but there are crowds as would be expected. Enjoy - it is a great event. If you get into a jam in town and need help send me a PM.
I just ordered my ticket for Friday - it was $6 general admission. What burns me is the $6.95 charge for email delivery. Can't pass up a day putting my hearing at risk at that price.