I'll be up-front; I am completely new to flash photography, though I have started to take more of an interest in it lately. Currently, my photography is purely for hobby purposes, though I do want to get involved with portrait/wedding photography in the near future, maybe as a part-time or side job kind of thing. I've read up a lot on various forums about flash, but couldn't find specific answers to the questions that I had.
Knowing that, I am debating whether to purchase the Canon 430ex-rt iii or the Canon 600ex-rt going forward from here, or one of each. I want to do off camera flash so I'll be purchasing at least two flashes. I can buy two of the 430's for the price of one 600, but I know the 600 is a bit more powerful than the 430's. Or should I consider the new Canon 600ex-rt ii with a 430ex-rt iii or another 600? From what I have read and gathered online about the new 600, it seems to not overheat as much when shooting a high number of shots within a short time-frame, but would be curious to hear someone's input in case they've used it at a wedding or portrait shoot before.
I've also looked into the Yongnuo's, but am kind of concerned about them lasting me for a while given what I've read online about them, or if I do get a shooting gig somewhere, am afraid one of them may fail when I need it most.
I see that Canon offers an extended CarePak warranty (or whatever it's called), and for the 600ex-rt flash, you can get a three year warranty (in addition to the 1 year warranty you get) for $99.99. Is that something I should consider, or do these flashes typically last longer than 4 years?
I appreciate any insight or feedback you guys can give me! And if these questions have been addressed in another post forum, please link it here and I'll take a look at that.