Canon 580ex Flash Manual

"I can use the barrel 580 of flash instead of buying the Canon ST-E2?

I have a canon 580 flash, plans to buy a transmitter STE2. I read the manual 580 flash, he says he can control multiple slaves? it can act as a transmitter? Is this the same thing with Canon STE2 capabilities? Im confused what to buy. help from anyone there? or I can buy cheaper flash, for example, instead of a STE2 550EX, I can control it with the 580EX? tnx!

You are right. 580EX can act as ST-E2. You can buy, you have 2 550EX flashes (580EX 550EX orders the camera off camera) while working.