Ok, guys these two make a great combo, but I really want to max out those HD650 of mine with a valhalla,
So I'm offering two trade options for your Schiit Valhalla amp:
Ipad 4 16 GB, about 1 year use, free smartcover + Shure SRH840
Nexus 4 16 GB, 3 months of use, free Ballistic Case, in it's box + Shure SRH840
The shures sound great from the ipad jack without the need of an amp, IMHO. Can't tell about the Nexus because I've never used that combo.