A few years ago just after I got my Digital Rebel, I bought the 420 EX flash. It was a nice flash with swivel and bounce but it really didn't have the power for slower lenses. A few years later, I got a deal on a 580 EX flash. Lots of power, built in diffusers, ability to be used as a master flash to slave the 420 EX. It's great having 2 flashes now for flexibility.


So for what it's worth, if you don't have the spare cash, go for the 430 EX II. Then down the road when you can afford it, go for a 580 EX II for the expandability and extra features. Either way, you won't lose. Just an a different opportunity for future expansion.