Best headphones under 800.00 USD

The Sennheiser HD-600's are well below that price (can be found below $300) and are very well regarded.

There are lots of great choices within your price constraint. The Sennheiser 600 already recommended is an easy choice, and well worth the premium over the next most expensive Sennheiser. Both the Grado RS-1 and RS-2 are worth considering, especially if you are going to consider the Grado headphone amp (the cheaper RS-2 seems to me the better value). For a more exotic choice, the Koss electrostatics are something of a black sheep, tarred by the rest of the Koss line, but, if you care about sound more than the sexiness of the marque, they really deliver--in my opinion a much better value than the comparably priced Stax alternative.

I have both the 600 and RS1. I like both but the RS1 gets unconfortable after an hour where the 600 does not.

To be more especific, I have reduced my options to 2 headphones, the Sennheiser HD600 and the Grado RS-1. I know the last ones are twice the price of the first ones, however I have heard the HD600 are better for large orchestral works, is that true? I listen to classical music, mostly symphonyc. Which ones would be the best option for my tastes regardless of the grados are twice expensive?? Thanks in advance and thanks for the responses above.