I can upgrade from my used 430ex to a new 580ex II for about $120. What are some pros/cons? I use the flash for sports photography and portraits. Recycle time is critical for me, and the 430ex has fallen short a couple times. Distance isn't so critical, but now I am bouncing light more, so maybe more power would help. There is a lot of dirt around the race track where i'll be every saturday night during the summers. The 580exII apparently has a dust seal of some sort? Will this actually help, or is it just a marketing thing? An added bonus of the 580 is that it should work with my cheap transmitters a lot better than the 430. Also doesn't it have the built-in PC cord jack so that I don't have to spend 10 bucks on one for my 430? What do you think? I like the 430, but I need a bit faster recycle time (does the 580ex II have faster recycle time?). As for the dust thing... if my 430 is around dirt a lot, what could happen to it? Any opinions from people who have used both?