I was thinking about waiting for the Yongnuo 600EX-RT since it is supposed to be released this month.
I would wait at least a few more months so that the reports start coming in on the YN 600. I noticed you mentioned the word 'reliability' later in this thread. Just saying...
That said, is there any reason why you feel the need of having a full set of off camera eTTL? It's fine if that's what you want to shoot, but you should know what you're doing/plan to do before making a purchase that big. On the flip side you can get a complete portrait setup, with off-camera manual flash, a controller that can adjust power and zoom, stands, modifiers and the whole shebang, for less than a single Canon 600. Then get a single Canon 430exII (or 580II if you can find it), for on-camera eTTL at events.