This is the best review of the SS HD 800 .  the review by

A bit overratedPosted 5/30/10
By Lunatique
Pros: Comfortable, detailed, big soundstage
Cons: Artificial sounding, anemic in the bass, can be too bright, overpriced

I have listened to the HD800 twice, and I never really warmed up to it. And to clarify, they were not casual listening sessions--I took my time and did the listening under the following condition: ----------On the This Link.  
 
http://www.head-fi.org/products/sennheiser-hd-800-headphones It also suggest many other headsets that he rates much better.   
 

What kind of music do you listen to?  That will determine the recommendations you get.  Some headphones are best suited for R&B or Hip Hop, while others are best for Rock, and others still are best for classical or vocals.