That being said, I recently picked up to Yongnuo 565EX flashes and like them so far. They run about $150 and function similarly to the 580EX except they cannot be a master (but can be slaves), do not have high speed sync, and may only change in full stops in manual mode.
I've read that you cannot change FEC for Yongnuo flashes through the Canon menus - which would be a problem for me because I ususally put the flash somewhere else and then operate it remotely. And high speed flash is a thing I really value - freezing a bird in flight with more than 1/250s flash is really amazing.
To the OP: I own the 430EX2, I bought it because its price has dropped so much that it only costs as much as the 270EX. The good thing about the 430EX2 is that it "just works", I am usually using it as a remote slave with my 60D in combination with the internal fill flash. Faster recycle time with an external battery pack for high speed bounce shots surely would be nice, but you have to shell out much more money for that.