Best seats in the Big House?

I'm about to buy my tickets for the Iowa game, but I wanted some advice. I'm looking at either section 21 or 22. Is it better to sit low (like row 10 - 17), medium (like row 20 - 35) or higher (rows 35 - 50)? Last year, I was in row 18 or so and it was awesome, but I have no idea if another place would be even more awesome. Thanks for the input.