Canon Speedlite 580EX Flash
When buying a Flash, at least the primary one, I would never go off-brand. Certainly the 580EX is not cheap and I would have been OK with the 480 or so but I did not want to buy one and later regret it. I do not shoot with two flashes currently so I cannot speak to the Remote (Master/Slave) features but as a flash this device is very nice.
It is easily adjustable for Exposure compensation. Not all my lenses are Canon so ETTL-II does not work with them but it still is very accurate with ETTL.
