[NigForce]

I'm looking to upgrade my headphones soon and as I do this I will most likely need an amp to power them. As of right now I am looking at: 
 
AKG
K701
K702
 
Sennheiser
HD 598
 
Beyerdynamic
DT880/250
DT990/250
 
 
Will the FiiO E7 be able to power these or would I have to look for more expensive ones?
Any suggestions on portable amp/DAC in a similar price range to the E7?
Any suggestions in headphones in a similar price range of the ones listed?

 

[TheBananaMan]

Getting any of these would DEFINITELY require you to get something more powerful than an E7. If you cheap out on an amp, most high-end headphones will sound worse than $15 headphones. Get a decent amp (I'm talking about $250 minimum) and it will sound amazing.