Right now I am using the Fiio e10 which is fairly new and it is nice although I am getting some static issues only through my macbook air. Not sure what is up there but it works fine on my computer. It can drive my DT 990-250 well and not going past 30% volume on it (Approx 2.5/8 on volume). But I am looking for something more and also more of a full size dac and amp. I am looking at getting the Modi and Vali as I hear tube amps are good especially on the 990s. Is it even worth paying that much for? Will it blow me away or anything? Is it much better than the Fiio e10? If it is worth the upgrade the modi/vali or the o2/odac be better? I like the modi/vali looks a lot more and is cheaper but if the o2 is worth more and sounds a lot better it may be worth considering. What do you think?