We have manga in our library as well... BUT NOT PLUS ANIMA! I am so damn jealous!
I live in Australia and I haven't seen +Anima in any bookstores; so I'm awaiting for the anime convention to come to Australia and then I can go on a +Anima rampage. xD
Definitely, that's exactly the same feeling that I had. It is a fantastic manga, I wish many others knew about it.
Oh, I also like Nana! Actually, I can't help but love every character~ ;D I haven't actually read the whole series yet, since it hasn't been uploaded on the internet and that is the only way I can read it.