Bump... surely someone can give me some advice?

Wow, sorry about the formatting - I posted this of a work computer restricted to and old version of IE, I'll have to fix the wall of text when I get home... Edit: Fixed it.

Hi Guys, long time browser first time poster. I am currently upgrading my headphones from and old pair of Sennhieser HD-590's and going for a pair of HD650's as I can source a pair for quite cheap (almost half RRP). Now I have a few questions for when I use them for gaming - I currently don't...