The V6 and 7506 are supposedly exactly the same, at least at some point. I've seen pics of a set someone had (on head-fi I think) where one side was labeled V6, while the other side was labeled 7506 ;)
And you can get velour pads from bhphotovideo.com
The G-Man is manipulating everyone to his own will. You see him interacting with both sides, he's clearly in control of the whole situation...to some degree. Mr. Freeman seems to be a mercenary out of neccesity, having no free will of his own.
The G-Man has power over space-time...
I tried it today, metroid prime just blew me away with the thumb strap thing for control. So I bought one :p The whole touch screen idea was brilliant.
I prefer closed myself, it's very subjective when it comes to these things :) I'd like to try in-ear etymonics some time as I hear great things about them.
I love my Sony MDR-7506 headphones. Great sound quality, low price (about 70-$100). They are industry standard phones, used in studios, DJs, etc a lot. You can also replace the pleather pads with Beyerdynamic dt-250 velour pads for about $25 which makes them all the more better. Best closed...
Gameplay: Doom 3 kept me far more on edge, it actually got my pulse going. HL2 never really "scared" me or get the blood pumping, if you know what I mean. And on this note, Shalbridge cradle in thief 3 takes the crown in this category :)
Graphics: HL2 has more variety. Doom relied on more...
This is just a shot in the dark, but it appears a lot of people are having sound related problems and stuttering. Lowering sound quality in the settings seems to help alleviate this, as it seems to have done that for me. If you can't get in the game to set this, you should be able to in the...