I've had the Sennheiser HD598's for awhile now, and I really like them but I want to buy something that has a little more bass because the lows on the 598's are not as good as I would like them to be. I want to spend under $200, and I'm leaning towards Beyerdynamic right now, but I'm not sure if I should buy the dt 770, 880, or 990 pro (250 ohm b/c I have a dac/amp). I'm open to any suggestions, and I want headphones that are going to be comfortable for long listening sessions and to play games like CS:GO. Thanks for the help!