My plan is to get my headphones in the first place (probably the new Sennheiser 598) and was looking to see what amp to get. I keep coming across the E7/E9, but not really know how to work together, when one is better just solution portable desktop solution against smaller, right? If I had to choose one, would I be better? I mostly be using this for music / movies / games plugged into my SoundBlaster X-Fi on my pc, but it would be nice to have a portable solution, especially if the E7 is not so weak compared with the E9. Or should I get the E5 at $ 23 and describe it a day for the reason that I am not an expert and do not know if I could tell the difference anyway. Or if there are other brands in the same price range I have to look for an entry / beginner level, let me know.