12-27-2015 09:51 AM
I would recommend of Canon's speedlite flashes. I would go with the 430EX II, 430EX III-RT, 600EX, or the 600EX-RT. The RT models are the latest releases. The newer models are RT, radio transmitter, controlled. The older models are infrafred controlled and require a clear line of sight to activate remote flash units.
I would recommend going with the 600EX-RT, or the budget minded 430EX II. The RT models require an RT transmitter unit in order to make remote flashes operate in radio mode. The flashes have built-in RT recievers The 600EX also has an RT transmitter built-it, while the 430EX does not.
Aside from the difference in flash power, I think the current sale price of the 430EX II makes it a great buy if you're on a budget, compared to the more powerful 600EX flash. You could almost buy two 430s for the price of one 600.