i'm possibly considering getting another amp that is a solid state for my hd650. atm im using the darkvoice 336se with 5998 and tungsol 6f8g to power it. it sounds fantastic but at some point i just want to be rid of worries when my tubes die and i go off looking for more and spending more $$$ than i should. is the burson soloist SL a great consideration for the HD650 as a solid state amp around the $600 range? i have the ODAC for a dedicated DAC.