After hours of searching now, I have given up. There is not much information about this topic on the internet. And when I finally find some, I get contradicting results all the time.
I am seeking a player, with a true line out for my fiio e17, and at least 60gb space.
I have looked into iPods, sansa fuze/clip, cowon and what not. But it seems they don't have true line out, and cowon is just too damn expensive.
I read some places that iPods have true line out, but some say they don't. And that was all generations they were talking about (except 7 I think)