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kp

Skyrc chargers are good
You can go for imax b6 (go for only original skyrc).
I am selling one.  With power supply

The wolfpack w6-ac  is a good charger. It also has extra functions like acting as a hot wire foam cutter,power supply, etc.
http://www.rcbazaar.com/product.aspx?productid=4919
Personally, I use the turnigy accucell 6 80W balance charger from hobbyking.

Even I use Turnigy Accucell 6 from hobbyking. I would recommend Either newer Accucell or Imax B6 Mini (Genuine SkyRC) which have PC-Link which you can connect to your PC. Those can also be hacked with custom firmware if it uses Atmega based MCU (some older ones didn't use IIRC). Also to get best results always calibrate your Charger with a good multimeter. On many Accucells and B6 minis the default calibration is a bit off. 1% tolerance is acceptable for Lithium cells.

If some one can post HQ tear down pics of Wolfpack w6-ac then I can comment on its build quality.