Go with whatever is the cheapest package that you can get. You're going to walk around the track a lot anyways. There's a ton of good viewing spots from the lawn areas.
The first year I was a guest of a track sponsor and got to experience the elite package. It was pretty nice with a buffet, and open bar and all but really just wound up watching mostly on the jumbo-tron.
If you sit at turn 1 carry a big hat and some sun block. Those seats just seem brutal to me.
Last year we were at the end of the back straight going into turn 12 sitting up high. You could see 12, 13, 14 & 15 as well as your choice of a couple of jumbo-trons. I would sit there again given the option.
At F1, we sat at the start finish for the start and finish of the race but spent the duration of the race in the turn 19 hospitality suite. This is a pretty cool viewing area as turn 19 is a nice, down-hill constant radius left hander that gives you a nice view of the racers as well as some potentially risky overtaking coming in.
I'm fortunate to have friends that work for and with the venue so I haven't ever had to shell out big $$$. But if I was on a budget but wanted to attend, I would buy the cheap tickets and pay the upcharge for the primo parking or consider a limo rental. The traffic control by Sheriff Bubba and Roscoe sucks every year.