Budget DAC/Amp recommandations for Sennheiser HD 600?

I need a budget friendly (as much as possible) DAC/amp that can drive sennheiser HD 600. I am in Germany if that helps. I have not used any audiophile gear in the past. I have seen some of the Fiio models being mentioned in the internet and will probably buy Fiio K11 if I can not find a cheaper version. Would prefer if it is desktop but I am also open to portables