OP fixed his problem several years ago I suspect. This is a 2012 thread, recently mined.
Warped rotors or otherwise misaligned aren't any more prone to squealing than straight ones in my experience.
Also, most 'warped' rotors are actually a buildup of pad material.
Chamfering the pads, around 30 degrees on both the leading and trailing edge is the most effective practice I've encountered.
(Speaking as a qualified mechanic, but I'm not a brake specialist)
I'm a huge fan of Hawk Performance Ceramic pads with the only downside being a little less initial bite when cold.