i have this one
http://www.amazon.co.uk/GMYLE-Wirel...F8&qid=1389181704&sr=1-2&keywords=wireless+QI
and i think it's good. only issue is the phone is on the side rather then standing up like it'd be in a dock which i've been used to with my nexus 4, however it's unlikely there will be a stnading dock qi charger so it's a trade off, and i prefer to be able to just put the phone down and it's charging. i also have a qi car dock in my car and again great as before i'd never bother to plug it in.
the one i linked is good as it has a rubber band (yours might too) so the phone is on a nice soft surface
I have 3 of those around my house for my N5 and N7. Excellent devices, and charge through a pretty thick case on my N7.