Due to a change in my job, I will have to do some frequent moving and want to build a second system based on my computer. I was thinking about it consisting of my computer, an usb dac, and powered speakers. I was thinking about getting the Audio Engine A5 for speakers. However, I'm unsure of which usb dac is should look into. I would like to stay in the sub 150 range. I don't have any hi- res files, most are burned at 16/44.1 using apple lossless. Thanks.