I was driving my akg k712 headphones with a sound blaster z card which has now died. I now have a really good excuse to upgrade to something more audiophile. I was looking at headphone amps before and the consensus was pretty much a jds labs objective 2 or a schiit magni. Has that changed? How do the massdrop versions of the O2 compare? I am on a pretty tight budget and probably going to space my dac purchase from my amp purchase but I am willing to spend an extra $50 ($150 total) for an amp dac combo if the amp in it is better than any of the amp only options. edit: In case it wasn't obvious I am looking for desktop amps. I have no need for portability. edit 2: After looking at your responses and some research of my own I have narrowed it down to 2 amps I am torn between the jds atom and the geshelli archel pro. In addition to just a general recommendation for amps under a $100 if anybody has enough knowledge to compare the archel and the atom that is also appreciated.