Okay if ultimate isolation mixed with great sound quality and last a life time build quality then get a pair of Sennheiser HD25s.
The Solo 2s actually replaced my Amperiors as my primary portable on-ear.
I'm sure there are many more alternatives of closed back good sounding headphones alternatives that don't mean;-
a/ you have to a look like a tw*t
b/ you have zero individuality
c/ want to be a drug dealer or gangsta
d/ don't have to replace your headphones every year or so
e/ don't support a gigantic money making all conquering monster of a marketing company
f/ accept second class 'reasonable or adequate' sound all in the name of perceived fashion, peer pressure or vanity
I don't know if this is satirical humour or genuine audiophile elitism... but I'm I think it's the latter.