Thinking about getting a pair of DT770's for music/gaming (currently have the AD700's, and while they're great for positional audio, I found the lack off bass impact made both music and games sound boring) and have, after some research, decided that the 250 Ohm version will probably fit my needs better than the 80. I listen to metal/metalcore mainly, but also do much gaming. (probably around 3 hours on weekdays and way too much during weekends)
Since I have no amp/DAC as of now (and not planning on spending a fortune on getting good ones either) I figured the Xonar DGX would be a decent addition, since it has a built-in headphone amp and 5.1 dolby sound, should I wish to try it. I was just wondering if the amp in the soundcard is enough for the 250 Ohm DT770's, and if it isn't then are there any alternatives that aren't too expensive that'd do the job better?