Center seating in the Upper Level is made up of Sections 425-428 and 408-411. The most popular sections in the 400 level are 409, 410, 426 and 427 which are closest to center court and have the best views of the enormous videoboard.
When choosing seats in these sections, pay close attention to the row you're considering. While Row A is at the front and easily has the best views of the court, it's also farthest away from concessions and restrooms. The section entrance is located at the top of each of these sections. Therefore, fans in the last row (13) will have the fewest stairs to walk and will have near-instant access to the concourse and its amenities.