New flash questions

Okay, I'm sure this has come up and I've read and searched here and gotten some info, but some of the flash models have changed. Basically, I've got a T1i and a 7dmk2 and no external flash. This is not something I'm going to use a lot, but I do plan on using one. So I'm leaning towards a clone of a Speedlite, like a Yongnuo. I'm thinking of a YN-568EX II. So is that a good starting point or should I be considering the 600EX-RT? As far as I can tell the differences between them are more about communications between flashes, cameras and triggers, correct? Are there other clones I should consider?

And triggers, should I consider getting a trigger for off camera flash right away or rely on the 568 triggering based on the built in flash?

thanks for any help.

I personally have Canon brand flashes, but ive read Yongnuo brand is almost the exact same thing as Canon. Ill probably get the YN-568EX II's for my next flashes. Im not sure if the YN-568EX II has IR or wireless capabilities but i have 2 pairs of the the Yongnuo 622c's and they work perfectly.