Hi Valerian & welcome to MR.
The problem is not so much which reader to get, but where to get the books from. Unfortunately we are a little bit disadvantaged due to the geographical restrictions. But there are always ways.
I have my reader since last year (Sept I think) and so far have managed to get most books I want without paying through my nose (as you would have if buying from Australian eBook stores).
It really comes down to what you want from the reader. Check out the
wiki for comparison and trowl the forum to see what other users have to say.
Feel free to ask questions, lot of helpful people here and quite a few from downunder now.