I cannot speak in terms of the DT770 Pro's but I do own and have used a pair of DT990 250 Ohm Pro's for the past couple years and I can tell you that I have listened to a lot of headphones that were in the $200 and less range and these are by FAR the best headphones that I have listened to.
Now I don't know your budget but if you can afford it I would get the DT990 250Ohm Pro's with a Objective2 ODAC (that's just what I use, but you can get whatever you think would best fit your needs) and I promise you won't be upset with your purchase. On the flip-side, if you don't really have, or don't want to, spend the money on that, I do know that there is a pair of DT990 Pro's that have low Ohms and could work just straight out of your computer with no compromise.