I can offer my opinion here as I currently own the HD700, Liquid Carbon 2, and the original Valhalla. Both amps are great, but very different. The LC2 really does require a balanced cable to sound its best, so if you are leaning this way, the cable is a must. My current headphones include Elear, HD700 and T1. My favorite combo is the Elear from the LC2 balanced. Very close second is the HD700 from the Valhalla. The Valhalla really brings out the low end and adds some air to the sound. The Elear however gets overly boomy with the Valhalla, but is very controlled with LC2. The HD700 is a little thin on the LC2 but still sounds decent (I do not have a balanced cable for this) but comes very close to the Elear/LC2 combo when plugged into the Valhalla. The T1 is similar to the HD700 in relation to the amps but is a bit brighter headphone overall. If I was auditioning these amps with the HD700, I would favor the Valhalla. my 2 cents YMMV.