Iwould wait on the Bold. I have had a Curve for a year, but I can not wait until the Bold is released. You won't be disappointed. No since in wasting the money.
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To the threadstarter, maybe my experience might help.
I'm using the Curve 8320 which i got 3 weeks ago. I was debating waiting for the Bold. But my carrier just kept pushing the date back. First it was august, then september, then end of september. In the end i gave up and after some consideration, decided to go for the curve.
Now that the Bold is officially released, do i regret getting the curve? Definitely not. I'm only missing out on GPS and v4.6, that's all. Oh and the faux leather backing. But other than that, i don't have any regrets.
But if you gave me an option to trade up to a Bold now, i would too.