1st I know what you are thinking skullcandys? pssshhhh yeah right... well they actually sound very good the bass is pretty bad but the mids, vocals, and treble is shockingly amazing.
 
Here is what I want- Hard hitting thumpy bass in ~100 hz area and good clear forward mids and detailed but slightly soft treble. I own the m50's so around the same amount of bass give or take, and I want a very fun sound signature, something new, but still accurate and real. I listen to 55% hip-hop 30% Dubstep and DNB and 15% rock and strings
 
 I do want style, primary reason I'm buying these is because the m50 is too large and obnoxious for portability in my opinion so i want sleek and stylish oh and portable. 
 
Clamp is a plus because I want to use this for weight lifting, and maybe just maybe for running in cross country season.
 
 No amp bigger then a n e5 or posssibaly new e11
 
So priorities (in order) - 
 
Fun yet natural sound
Strong round bass
isolation needs to be around m50 level so about 25ish db I think
clear forward mids
Portable
Stylish
Detailed treble
Easy to power
Convenient 
 
 
Oh and also It will either be a new MS300 for 140 or used MS400 for 140 or used HD25 for 140 orr aviators for 150 new all on amazon 
 
 
I'm very scared about used too so i was wondering if i had anything to fear? Heard rumors of ms400 having weak bands at least the old ones 0o
Will i get a warranty with the actually company even if it's used, will i get fakes?

I forgot to say comfort is importantish o wold got the k518 but comfort was bad and I would get the q460 but isolation is bad