twofold said:
I don't think it'll be possible to top these suggestions, unless you up the price bracket that is.
Yes it will.
These babys (the first ones on the page)
http://www.alessandro-products.com/headphones.html
are far better than
anything else @ $100 and a significant price bracket over that (especially if you count tardphones such as Bose and Sonys "high end" models).
If you aren't willing to spend that much there is also the classic Koss Portapros, that sound a lot like the PX 100s only with a bit more kick in the bass. Also they've been produced the same way for the last 20 years. If that doesn't bode for quality I don't know what.
Again best phone at the price.
Senns are fine too, but there
are equal or better alternatives if you search a bit.
With headphones there are two main construction principles. Open and closed.
Open has hands down the best sound quality and is the only real choice for a critical listening. They have the "problem" of letting almost all sound in and your surroundings are going to be able to hear the characteristic headphone whisper at higher volumes.
Closed headphones are for people who want to keep sound out and in. Such as DJs, public transportation, studio engineers etc.
But they are very hard to make with a quality that comes near to open headphones and for them to be effective at all as a sound blocker they have to be surrounding the ear completely, which 1. compromises bass quality since the drives doesn't get so close to the ears as with on-ear phones and 2. can get very hot at normal room temperature and unbearable in the summer.
The main reason for listening to headphones shouldn't be for privacy, it should be because headphones has the most pure, detailed sound you can get at any price.
And surround sound? You only have two ears. If the software is made right you will be able to get far far better surround effect than with any speaker setup.