There are no ebook readers that meet your criteria. There is no Pearl display ereader directly available to you that supports Doc(x) and PDF for €150-230ish, especially with underlining /highlighting ability with a pen.
The only one that is close would be the Onyx Boox A60 "Hamlet" Series which goes for about €200
Its meets all your criteria but is only currently available from the Russian distributor
http://www.onyx-boox.ru/boox_a61s_hamlet
http://www.onyx-boox.ru/boox_a61s_bianca
they might sell you one but the only way to find out is tho contact them directly.
The Onyx Boox A60 and its branded clones are excellent readers. The firmware is very mature and stable and offers everything you are asking for. The pearl display versions are just launched and should be just as superb. Of course they support multiple languages and its just a settings change to fix the UI to English.