I looked into Yongnuo and Neewer flash, and it turn out that they over rated their guide number. At best the Yongnuo and Neewer flash actual guide number are just slightly above the 430EX II Speedlite in TLL mode and match the Speedlite in manual mode, which is well short of manufacture rated guide number. Hence it make sense for me to get a used flash that give me a bit more power at roughly the same price as the Youngnuo.Id look into buying a Yongnuo 565ex
I have to agree that is a great price.http://www.bhphotovideo.com/c/produc..._AF_1_TTL.html
Can't beat this for the price if you want the TTL functionality.