I'd suggest the ODAC + E9 over just the Asgard anyday. In fact, I prefer the E9 over the Asgard. People can shoot me if they want. I do however love the Asgard with the HD-600 and D2000.
Based on my experience, a DAC for the HD-650 is just as important.
Don't let anyone tell you the E9 can't drive the HD-650. Impossible!
You can also later sell the E9 if you want and get something better. E9 is now down to under $95.
BTW E7 I think would be pretty good for the HD-650. That's another OK budget alternative to the ODAC, but the ODAC is worth every penny.
E10 would probably be awful with the HD-650. Worst DAC/amp I ever heard with the HD-598. Oh wait.. I did have the Nuforce Icon Mobile once...
Edited by tdockweiler - 11/28/12 at 5:58pm