The ATH-50's are supposed to be nice, haven't heard them though. Here's my current stable. Have to say I'm partial to over the ears for sound and I can passively isolate on planes. The active noise canceling ones like Bose actually hurt my eardrums.
Amps
These over the ears sound WAY better when driven by my tube amp.
bottlehead.com/?product=single-ended-experimenters-kit-2-1-for-headphones-sensitive-speakersPortable amps
I have a Hornet, and yes, it's a GREEN Hornet. Best portable amp I have and it DOES make an audible difference.
www.raysamuelsaudio.com/products/hornetAt work I use this because it's USB and optical and I mainly have it hooked up to my work Macbook so as not to wear out the headphone jack. Good but not as good as the Hornet.
www.whathifi.com/ibasso/d10/reviewOver the ear
HE 400: VERY nice but you need a good amp. These aren't closed so the sound does leak. They planar headphones so mostly home use
Grado HF2: Special head-fi.org Grados that were limited quantity. I got in on the deal and was lucky. They sound FANTASTIC, a big step up to the 325i's I had at one point.
Shure 840: These are what I travel with even though they're on the big side. I got them for $125 and it's the best deal I have. SO good and doesn't need additional amping.
Harmon Kardon CL: I got these cheap ($80?) on Amazon w/ the hopes they could replace the Shure since it's smaller and easier to carry. Meh, they don't sound good and are only on the ear so not great on a plane, I can still hear background noise.
IEM
ETY HF5: OK, I lost my molds (Dangit) so I moved to Comply Foam tips. They are OK but not my go to. I just use them in the car as a headset now.
Monster Turbine: These are my office headphones, mostly 'cause I got them under $100. They actually sound good despite the fact that I utterly DESPISE Monster.
UE TripleFi.10: Hands down, still the best. I 'kinda' travel with them but I like the Shures on the plane cause I can wear earplugs AND the Shures and shut out the world for a nice nap. BUT I also use these UE10's w/ Comply Foam tips and they sound PHENOMENAL, even straight from an iPhone. Still my best IEMs. I have had to replace the cables because they aren't that durable.
Curious how those Philips work. How are you driving those? Bear in mind that your iPhone/iPod may not have enough drive for it, unless you have one of the older iPod Classics w/ the Wolfson DAC. Also, don't rely on the AVR headphone jack. Those are AWFUL and can make great headphones sound awful. Your source materials matter as well. My best is using my tube-based CD player. Yup, you read that right.
www.stereophile.com/cdplayers/1103tjoeb/If you're looking for audiophile grade gear at good prices, take a look at audiogon.com. It's ebay for audio. I've spent a ton of money there...