Thanks for letting us know what your budget is. I am a huge fan of the HD6XX and didn't type much last night as I was on my tablet. The HD6XX besides being affordable are super comfortable, relatively easy to drive, sound great, and there are a lot of accessories available for them, things like earpads, different cables, etc. Headphones in this price range often do one thing well, lots of bass, nice midrange, etc., but are often a one trick pony and don't do everything well. The HD6XX aren't don't stand out in any one area, but are more of a jack of all trades, doing everything very competently.
I have about a dozen headphones, many of which cost much more than the HD6XX, including LCD-4, LCD-XC, Sony MDR-Z1R, Sennheiser, HD800, and Focal Elex, to name a few. While these more expensive headphones do sound "better", I find myself reaching for the HD6XX often because of their comfort and while they may not be quite as good as the others, they come very close, do no wrong, and are very easy to listen to.
I keep mine in my bedroom, as that is where I use headphones the most, often listening as I go to sleep. The LCD6XX are the most comfortable set of headphones I have for this purpose.