All mine are budget level headphones.
1. Creative Aurvana Live!
Easily my favorites, with a warm, mellow tone. They work very nicely as a all purpose set, though I'm sure there are better headphones for sound stage. I've worn mine so much I had to replace the original pads with some velour pads, but this hasn't changed its sound very much. Not very durable, so treat them with care.
2. Philips SHP9500
Haven't had these long, and have few complaints so far, but also few words of praise. There is little bass extension, which many have noted before me. In reality, it does nothing better than the Aurvana's other than having slightly cleaner sounding mid bass. Still, they are a decent set for the $50 I paid for them. Main physical weaknesses are the non-removable ear pads which are a little scratchy, and the loose fit.
3. Koss Porta-Pro
I've modified mine to use Sennheiser HD 25-1 II velour pads. They are a fine choice for portable use, despite the muddy bass.
4. AKG K240 Mark II
These headphones have become my least favorite over several years of use. The caps on the back cracked spontaneously, and it proved impossible to get replacements. I use the velour pads. Sound with these AKG's is a bit dull for most of my music, detached, and has no liveliness at all. Reasonably good headphones for watching tv or movies, but I just don't use them often.
Have you modded the SHP9500s? Definitely improves them IMHO.