Assuming you are thinking of symphony or chamber orchestra, then I agree with the recomendations for middle and back of stalls, front of circle and boxes A/B/U/V; probably I would say the bixes were the best bet (though I don't have much experience in the "premium" seats in the very middle of the stalls). I found the sound to be rather attenuated by the back of the circle, and rather over bright right at the front of the stalls. Within the boxes A/B/U/V, I found all the seats great (no difference from the front of the box to the back). In value-for-money, Boxes D/X can be a good choice, as they are sometimes a lower price band than A/B/U/V, and sound almost as good.