I was in sector 261 of those orange ones in the upper range from 255 to 276. I believe that this area of sectors offers one of the best value-for-money experiences. As you can see, you have a full view of the field (I was slightly shifted to the right; if you choose a more central sector like 263 or 265, it's even better), and you thoroughly enjoy the game. Just be careful not to get seats too close to the railing, as it might obstruct your view.

As you can see from the picture, the view of the stage is excellent. The arena is very beautiful, the acoustics are not the best (as is the case with all sports arenas), but it depends on the type of concert. In my case, with Bjork's music, it wasn't that bad (probably with louder rock bands, distorted guitars, etc., it might not sound as good).