Consider a Meike MK600 ETTL (exact name). It does M flash, ETTL, HSS, Ext power and is a 'master' under Canon Wireless Light/IR type. If later on you go with Yn 622C, Yn 622-TX or Phottix Odin (my choice) triggers, it plays nicely with all of those. It's very similar to a 580ExII but lacks some CFns and is slightly slower to recycle. Long term reliability - unknown. I picked one up as a spare to my Canon Speedlites - so far, very pleasantly surprised!

