Since nobody answers I will add some info by myself.
First, I fell in love with the UI of Kobo, I think it's amazing. And I've thought that purchasing a book in its books store would allow me to sync my reading just like kindle. But it didn't happen. I bought a book there and it DOESN'T SYNC between iphone and PC. Too bad. I chose Kobo instead of Kindle because of the interface and because the same book was 2 bucks cheaper =)
Besides Kindle, any other option to sync the last page read?