I currently own a UCA 222, and was looking for a amp or amp/dac combo in the 100$ range. Would this make a major improvement over the UCA 222? Or should I just get a standalone amp like the bravo V2 tube amp I was looking at and upgrade the DAC at a later time. I plan to be using this with Bose AE2, AKG K7XX, Sony MDR V150 and Superlux HD-562. I will be using the AKG primarily.