Best closed headphones?

I was going to update my first post but thought it would be better to start new with a more refined request.


I have been doing some research but I'm away from home and have limited bandwidth. 


I'm looking for a headphone which has a large sound stage, clear with accurate bass but not base heavy.

They cannot be more than 250ohms since I will use them with gs4. They need to be closed/semi closed or sound isolating since I need to drown out London noise.

My budget is upto £300


Thank you!

Probably a modified Fostex T50RP, either the MrSpeakers Mad Dogs or the Mayflower Version 3s. They're the value for money champ in closed cans.