Audio Technica Ath-AD700, very nice treble clarity with excellent soundstage and positioning. Great for 1980s new wave like Gary Numan and John Foxx (Ultravox) aswell as classical music. They're so comfortable i dont even know am wearing them. With my Onkyo TX-8555 stereo reciever i can also feel a good amount of balanced bass but probably nothing that would satisfy bass lovers. Sound isolation is just about non-existent so best played in quiet environments or at night if you dont have anyone near you.
Koss Pro-4AA, grew up with the original version in the 1970s and they were the first headphones i used to play computer games on. Got the new version this year and am enjoying the extreme detail and amazing directional positioning in audio. I can actually feel myself turning in a game as the sound shifs from one ear to the next in silky smooth stereo. They are retro looking and heavy but they're the most enjoyable soundwise for me. Sound isolation is good thanks to the weight comfortable fit for a fat head like me :)
Koss UR-40, another crystal clear treble based headphone which is great for gaming. I have both the titanium driver and older non-titanium driver versions and they both sound great with the newer titanium drivers giving much more bass. Very comfortable and just like the Ath-AD700 i never know am wearing them. Sound isolation from the outside is also decent.
Sony MDR-XB500, amazing on the spot bass which i can feel when playing games like SUPREME COMMANDER 2 as my giant robot stomps across the battlefield. Using the equalizer to raise the treble some the MDR-XB500 sound very balanced with plenty of bassy warmth which doesnt overpower. Sound isolation from the outside is excellent thanks to the very comfortable pillow like ear pads.