Hey guys, at the moment I'm in the market for a new pair of headphones, and I was looking at getting a pair of Grados, either the SR80i, or the SR60i. Is there a large difference in the sound quality between the two? I've read that the 60's are easier to drive, while the 80's sound much better amped. I'll be purchasing a Fiio E7+E9 combo at the same time, so I'll have an amp. So essentially, is it worth the extra money to buy the 80's, or will the 60's work just fine?
As a side note (since I'm completely new to amplifiers), is the E7+E9 a good combo to drive Sennheiser HD 600's? Or should I go with a different Amp/DAC? Thanks.