So I saw a really good deal for a second-hand pair of sennheiser HD600 for only €125 and bought them immediately but now the problem is that I need something to power the headphones that doesn't cost twice as much as the headphones itself. Are there any Amps with built in DAC around $100 that...

So I saw a really good deal for a second-hand pair of sennheiser HD600 for only €125 and bought them immediately but now the problem is that I need something to power the headphones that doesn't cost twice as much as the headphones itself. Are there any Amps with built in DAC around $100 that...

So I thought I bought a second-hand Sennheiser HD25-1 II but upon closer look I discovered that on the side it says: "HD 25-1" and not "HD 25-1 II"   Does this mean I have bought the old version? And if so, what is is the difference between the old and the new "II" one? I did not receive any...