I'm in much the same position, my concern is whether by the time I'm due an upgrade I'l still be able to charge the blooming thing!!! It seems to be getting very picky about chargers.
I have a great nokia charger which used to be perfect, then became unreliable and not won't start charger it at all - but is fine with a Nexus 7. I purchased a new one of the same chargers and found that it won't charge unless I am forcefully pushing the connecter into the phone... so tis useless.
The only relaiable lead I have found is an old HTC one which works perfectly despite feeling like it'll fall out at any moment!