Before I go into detail about my inquiry, I'd first like to make it known that this is my first post, although I've been obsessed with head-fi for about a week. I'm a mere infant in the world of true sound, so even the most basic explanations and details will be much appreciated. Secondly, I'd like to express my gratefulness for the extremely knowledgable foundation I've found with everyone here. This will be my home away from home (as far as the internet goes). Many thanks to any and all who take the time to supply good advice. Now on to my inquiry! I've found a lot of good threads, but none quite answer my specific questions. I've recently purchased the ATH-M50's (a few days ago), which is the most expensive set of headphones I own. I'm upgrading from Skullcandy's Titans. I know, I know. Anyway, it seems that the ATH-50's are a hit and miss with my musical tastes; various sub-genres of melodic metal with sophisticated riffs and complicated/layered musical scores (instrument separation and detail is VERY important to me which provides reason to upgrade), classical, and bands like Paramore and He is We ( prominent female lead vocalists and for the most part simple compositions with an acoustic kind of feel ). I also enjoy electronic and dubstep quite a bit. With that variety of music I find that the M50's are about half of what I want. I'm looking some cans (as everyone in the hi-fi world calls them ) that are very accurate and neutral, but at the same provide SOME color and fun. So to put it numerically out of 100 parts: 70 parts accurate and 30 parts fun/colorful. If anything, I'd prefer the cans to have excellent mids and uppers rather than on the low end. Both of both worlds if possible. I'l admit, when it comes to a lot of the technical terms and understanding of those terms, I get lost. Hence, very basic and fundamental desires and descriptions. My price range is 400< for the cans. I'm willing to go ever so slightly above that if it is warranted. I have a FiiO E17 on the way and would like to know some examples of cans/specs they can supply ample power to and then some that are slightly above its capability, and that way I know pretty well where my range is. I'd also like to know what DAC (200< ) you recommend, and if you think that a 13" Macbook Pro (early 2011) needs a good DAC anyway. I've heard good things about the E17/E9 combination. Some cans I'm very seriously considering are the HE-400, HD 600/650, and the DT 880 (250 ohm). The HE-400 have my greatest interest at the moment. I realize that these style headphones aren't really portable, but I will be using them on the move. Yes, right after I invested in the ATH-M50's..I fell head-first in love with the world of sound and I'm in the "that escalated very quickly" mind-set. As I've heard many times around these threads...."sorry for your wallet". How very, so very true. From nothing --> ATH-M50's --> 300+ cans and equipment in less than a week! Unbelievable!! Oh well Considering my tastes in music (second paragraph), would the cans I mentioned be a suitable match in your opinion? Which of those would you recommend? Do you think the E17/E9 combo will be effective for those caliber cans? If not, then what do you think would be? Portability is very important. I'm open to any and all recommendations and advice, none of which have to limited to the equipment I mentions. I really would some help, I've been so single-minded about this adventure, and would very very very much appreciate guidance from those well-tread in this territory. So much thanks!!