I sold the one in the pics for around $300.

???????
What does this have to do with the original question?
I don't quite understand this recommendation. I'm sure it is a nice amp, but the OP mentions a budget of $200, possibly as much as $300. The SQ-84 is over $1000 new - http://soundapproach.com/soundquestsq84v2integratedheadphoneampwremotevolum-p-1440.html And I have a hard time believing they drop under $300 used, or that they even appear on the used market very often at all (there are none on Audiogon right now, for example).













