New guy here, trying to hopefully get some help from intelligent people about keyboards

I've gotten myself a Noppoo choc mini less than a year ago, and after some time, I've noticed that arts of my keyboard keycaps are dulling : http://i.imgur.com/UCmgACN.png
So i'm looking for a replacement keys. I've looked around many sites, including this site(with search) and still didn't quite understood what keycaps I should aim for... As they say - better safe than sorry

I'm interested in getting white keycaps( something like this - http://i.imgur.com/z6U2DS9.jpg ), but I don't mind if they have prints


I mean, I would appreciate any useful info to what type of keycaps I need, or even better - links to store selling the right/fitting ones

Thanks in advance~
Maya