I hope this is the right place for posting slightly amateurish questions, but I'm looking to buy a budget system while getting as much value for my money as possible. I'm currently looking at the Onkyo A-9010 amp (with a built-in DAC), paired with the Mission QX-2's. I'm thinking of using my computer or iPhone as the source, so USB, wireless streaming (via an iPhone), or AUX (via my computers soundcard) are my only outputs. I don't trust the AUX output to be that great, so I have to pair either USB/streamed audio with the amp's coaxial/optical inputs. The alternatives I see are thus: Getting a separate DAC with an USB input. In that case, which? Should I pay slightly more for an amplifier with a USB input or streaming capabilities, with a decent built-in DAC? Note that iPhone's don't have AptX-bluetooth, so I'm a bit hestitant concerning that. I guess I can also buy a relatively cheap audio source (streamer) which actually has coaxial or optical outputs - I know there are also streamer/amp combos like the Bluesound Powernode 2i, but that specific one is out of my budget Or are there any other recommendations?