I'm looking to buy a flash for my DSLR (t4i) but I don't really know much about external flashes besides the fact that I need E-TTL/TTL. I haven't yet learnt how to manually control the flash but I'm ...

Any suggestions and I would prefer not to spend over $150 on one. So far, the cheapest option is the Yongnuo 568ex but I really don't want to spend $180 on one. I am shooting a cycling race in 2 weeks ...