I would recommend heading to one of the stacks (if you're not already close to one).
Since your seat is in 3rd row, it shouldn't be a problem to swap seats with someone who is in line with one of the stacks and maybe 2-3 rows further back or even in the same row. I've done this a few times.
This way, you won't record a lot of ambiance, which is usually a good thing in an arena, and it will be louder, which will help drowning out crowd noise.
If you can only bring one set of mics, I would probably choose cardioids, but omnis might sound better if you are extremely close. (Then again, I'm not familiar with those SP mics.)