The title pretty much states it all! I'm currently running a pair of DT770 Pro 250's and I absolutely love the sound they produce. I run them through my Lenovo T520 laptop when at home, and my iPhone 4s while tripping around. I listen to mostly:
Indie / Indie pop / Indie rock / Indie chill / Indie alternative
Atmospheric / Chillout
As you can see above, the majority of my music preference can be categorized as easy listening, mellowed out music, with a bit of added pop and rap. When listening to chilled out music I appreciate the deep, tight lows and a reasonably flat frequency response (which is why I purchased the DT770's) that doesn't accentuate the higher end frequencies too much, as well as a wide soundstage. The DT770's perform very well in each of these categories, but I feel as though the low bass could be accentuated a tad more. The same goes for Dubstep and Rap, as the bass is pretty important for me in these genres.
Taking the above into considering, are there any amps that would be a good fit for these cans and could possibly bring out the bass a bit more while keeping the sound clean and well balanced? I haven't looked too much into amps except for the Fiio series, which seem to be recommended quite a bit around here. One thing I'm worried about is the bass becoming muddy / distorted and I would like to stay away from this as much as possible.
Also, I'd prefer the amp to be fairly portable and not completely designed for stationary home use, since I would like to possible carry it around with me when I go out. This is negotiable though, if any of you could convince me that a stationary amp is a better choice . Thanks in advance for the responses I'm sure you will all provide! This site is great!