Hello,
Welcome to the forum. I was looking at your list and my answer is fast: none
.
First of all, there's no good store for Spanish titles (there're some small stores, mainly with PDF e-books, some with sci-fi titles, other mainstream), but wide catalog and best-sellers: none.
I think the only one with big screen and touch screen is iRex (or iLiad, I don't remember well), and it's about 400 or 500€ (a friend of mine watched one at a VIP's, so perhaps you can find one there).
And DRM-free, tsk, tsk. There're going to be two big platforms in Spain, which will be introduced at December, but both of them will include DRM (one of them will seel ePub and Mobipocket DRM-ed books).
Sorry, I can help you more. And a recommendation (if nobody is angry about it). For ebook readers in Spain, you can look at:
Lectores electrónicos.