Are we still certain the redesigned structure of the phone is a pro?
I do like the idea of structural elements having dual purposes, but until apple can find a way around antenna detuning without using a bumper, then why not wait until June 2011? I really feel like Jonathan Ive dropped the ball on that one. Maybe they can find a nonconductive coating to resolve the issue. If I bought the iPhone 4 at launch, it wouldn't have been a deal breaker, I'd have gotten on with using the bumper, but it's a problem. Why buy one right now if you have any generation of iphone already.
If you have an iPad, then 600mhz or 1ghz wont matter in the iPhone. I'm on the bus right now with my iPad, and it's pretty damn good.
With an iPad, my iPhone gets to do phone calls, SMS, quick checks of email whilst on the tube and music. You don't need a 1ghz chip for just those tasks.