After reading Fewtch's comments about how the Go-Vibe could drive the K501's adequately, and the K501's being so cheap nowadays, I thought I would possibly pick up a pair of them, or one of the following: AKG K501 - $129 Beyer DT150 - $163 AKG K271S - $160(?) Senn HD280 - $75 ($95 if I get GC's 2-yr replacement plan) Beyer DT250-250 - $148 I've been pretty impressed/happy w/ the Go-Vibe for months now with my DT990's (2004 version), and want to add some sonic flavor to the mix w/ a new can. True, I've had the HD280's before (and the DT250-250's for a short time) but liked their sound signatures, plus I'm leaning more towards a closed can, so they're back in the running. If I play my cards right, I may be able to grab two of the above. All with the possible exception of the K501 should be adequately powered by the Go-Vibe (and w/ Fewtch's comments, the K501's might be just fine with the Go-Vibe, although bigger amps would provide bigger improvements, obviously). So, for a rock guy, who also listens to some musical scores (Danny Elfman stuff, Star Wars, Signs, etc.) and some jazz, which would be the two best other headphones besides my 990's?