I'd definitely suggest browsing forums like head-fi and other sites more focused on audio. You will be able to find much more comprehensive explanations there as they are probably more knowledgeable on the subjects.
Through some quick searches through forums, I find a very popular headphone for general purpose (music, gaming, movies) in the ~$50 price range are the JVC HARX700 and HARX900 headphones. Thousands of people chose this as the best bang for buck by far in this price range and they look like they have pretty good construction and materials for the price. I won't spell out all the pros and cons about it, but they seem like a great pair of headphones and I would definitely put out the extra 15 bucks and get the better one...