+1I currently use an ODAC. I upgraded my O2 to an Schiit Asgard 2 mainly to get the bigger volume knob and the lack of line in sticking out of the front. Otherwise, I think the improvement in SQ (if any) was very, very minor. Go with the O2 and ODAC and you can be happy with some very good sound
Some people are looking for that extra 0.1% to 1% improvement they get out of a different DAC/amp setup. It's not for me--and people with no amps like the OP shouldn't be encouraged to think that way--but to each his own
Also, your budget allocation is bass ackwards if you are after SQ. You should be spending more money on the speakers and much less on the amp. Don't believe me? Go ask the guys here or here who know speakers.