I'm on a budget but want to get some Senn HD600's. I'm not so nieve to believe I don't need an amp with a little power, but I'm realistic to know I can't spend more than $200 on an amp. I currently have a Fiio E10, but would this be enough. I know Fiio is cheap so how about the new E12 or the E17? I want a Amp/Dac and portable+desktop would be even better. Yes, I'm sure I could search for this but haven't found this exact question and I'm at work so I can't look all day.