Beyerdynamic Tesla DT 1350 or 880 or anything else

[eddieg24]

I am looking for a well balanced headphone in the 300-500 dollar range that will give me well balanced sound, good comfort, and be able to use while walking outside, the occasional flight, and at home hooked up to my emotiva preamp headphone jack.

 

[Mutnat]

You might also want to look into the Audio Technica ATH-ES10's.
 
This thread has a shoot-out of a ton of stuff: http://www.head-fi.org/t/433318/shootout-102-portable-headphones-reviewed-panasonic-rp-htf600-added-04-29-12. The "A" category has some stuff in your price range including the ES10's and the Beyer 1350's.