I'm looking for open cans. I have a fiio E10 and because of other financial commitments (getting a tv, a Fiio E11, ipod classic) I would like to get the best possible open hp I can for around 300. So far I've looked at the AKG Q701 and the Grado SR225/325i. Would my E10 on high gain be able to power these two? I already have a pair of Shure SRH840s as my closed hp right now. I listen to a little bit of everything but alot of Rock and Jazz. Thanks guys!