I finally pulled the trigger and bought the 600EX-RT. I've been playing around with it and I hope my perception is correct but I do think the 600EX is doing a better job with flash metering than the 430EX II. I've always longed for a distance scale while I only had the 430 (the 430 only showed the max distance). I just blew my work bonus check with $5 to spare for the new flash
@AudioGlenn Yes, I have now experienced what you meant (ease of use). In case you missed it, CR let out a story this month about a 430 that's gonna have RT in early 2013.
I'm still keeping my ST-E2 until I can get a couple more 600's or 430 RT's (see, it never ends, never ends). But that's gonna be more than a year away.
Thanks all for the advice. I'm very happy.