Coming from a K240 owner, they are not portable at all. They're hard to drive with portable players, you need to run them at full volume to get any kind of performance from them and the sound you get is pretty unimpressive. There's also the problem of them being semi-open meaning there's no isolation to speak of, and the fact that they have no folding mechanism makes them quite hard to carry around anywhere.
I'm a person who has been subsisting on $10 earphones for a while, and am finally looking for a considerable upgrade to full headphone. As I am new to these kind of matters, I would greatly appreciate any help or advice. Below are my criteria for getting one:
budget: ~$70-80, no more than $85
Weight: no more than 1 pound/16 oz
Supra-aural/Circum-aural: definitely circumaural
Closed/Open: fine with both
Listening environment: mostly at home, sometimes moderately busy offices
Audio source: My HP dv7t laptop, with IDT HD audio codec. Music usually at 200-320 kbps.
Audio equipment: Just my laptop. No amps
Music genres: fairly broad, but tilts heavily towards electronica and indie rock/pop. some hip-hop, rap, and rnb in between. a touch of jazz and new age
Any particular choices I should be aware of?
Not really a portable but you might find the AKG k240 studio in the FS forums here for less than 80, i have seen them. and i like mines as much that i even dare to recommend it.
I have also seem some ATH M50 for lower then 90$ in the FS forums, but you might have to be patient for this one.