I'm glad you're happy with your headphones, sounds like money well spent. In the UK the Hifiman he-400's are £400 ($632), £50 ($80) more than the Beats pro
I don't know if the headphones you've listened to were broken, but for me the pros are the only beats over ear headphones where the bass isn't muddy IMO. Solo HD's are awful and are expensive neck wear, Studios are OK for everyday listening but £100 overpriced, bass heavy and cheap plastic, Mixr's aren't bad but again about £100 or so overpriced, but pros are very good IMO.
I have the beats tours too and once you fit some comply t-400 ear tips they are actually pretty good for everyday use such as going to the gym.
Other headphones I liked were the Sennheiser HD800 but they're £1000 ($1600), and the Beyerdynamic T5P but these are £760 ($1200), both well outside my budget.
I assume with these headphones mentioned on here folk are using headphone amplifiers?