1. Sennheiser HD 650/Zu-XLR: warm, inviting sound that always works for me; I never tire of its presentation and character - the HD580/600/650 has been my sound for over 2 1/2 years now
2. AKG K 1000: more resolving than the HD650/Zu-XLR but doesn't sound as cohesive and isn't as universally enjoyable as the HD650 to me; the presentation the K1000 achieves is certainly unique, however
3. Beyerdynamic DT770-80: these really are much better than their 250ohm brethren, and they are now my third favorite sealed headphones (right behind the K271 and DT250-250); the fact that they are the most comfortable sealed cans of all IMO (the silver velour is still unmatched and the headband is perfect once Kramer’s mod is performed) is why they're sitting atop my head as a type this at work
4. Alessandro MS1: a tad bright and tonally lightweight, but it's the best semi-portable open 'phone I've encountered and it lends nearly all genres a fun spin
5. Sennheiser HD25-1: the most portable full-sized headphone; this 'phone is warm and fun with great impact and clarity (especially when the stock steel cable is upgraded to OFC copper); they're not the most neutral or detailed sealed cans, and the clamping can grow wearisome (even with the velour pads and ample break-in/stretching), but for portable usage I have not found a more appropriate solution
6. Koss KSC-75: colored, a tad bloated and oh-so-fun! These classic cans started life as the KSC35 and PortaPro and the same basic design is still a winner - the resolution is startling for their price, and they fit snugly inside a beanie
7. Sennheiser MX 400-RC: these earbuds were included with my iRiver and while they cannot compare with the aforementioned cans above, they do hold their own and are some of the best 'buds around; the fact that they're ~ $10 only sweetens the package (I still listen to 'em every once in a while to remind myself of the average listening experience and I still have a blast with them on - it's the music, stupid!)
EDIT: Actually I think I prefer the DT770-80 to the MS1...