Hi every, maybe you guys can give me a quick help, i have 2 potential deals with these AMPS at the same price, which one should i get? Both are used but in good condition, i will be using them with a Musical Fidelity V90 DAC and Sennheiser hd 598 and in a few months hd 600 (or hd650 if i can...

The more i've read the more confused i've got. My DAC will be used with my windows 8.1 (64) desktop so i can upgrade my old e17.     Cans -    598 (my e17 works well with these so no biggie) 600 (coming, ence the problem)     IEM (just for more information)   JVC FXT200ltd RHA 750...