With nearly every reader that suports Adobe DRM and has a WiFi connection you can download books from any shop of your choice, be it Kobo, Obreey, Thalia...
Only this sync-function will only work with books bought in the Obreey store, I guess.
With Calibre you can attach "tags" to your books which will show up as "genre" on the reader, that is the closest thing to the Kindle collections as far as I know, you can also build a folder structure how books are stored on the reader. Not always self-explaining, but the guys from the Calibre forum are always very helpful.
TTS is a nice to have and doesn't sound too bad, but if I want to have a book read to me I definiterly prefer a proper audiobook (which is seldom enough)
For support you can ask Forkosigan who is very active in the german part of this forum and also responsible for technical support as a PB employee here in Germany. He speaks english and I'm sure he will give you some tips regarding support in Portugal.
There was a big review in a german blog today with many and very good screenshots, maybe you want to have look at it and have it translated with google
KLICK