Is the extra VRAM worth it?

I'm looking at getting a 20" iMac Intel Core Duo, and I'm wondering if it's really worth it to get 256MB of VRAM instead of the stock 128MB? Where would the extra VRAM get used? (ie. Will iPhoto or iMovie run faster?) My current PowerBook G4 has 64MBs of VRAM (and I drive an extra display with that), and so I'd already be doubling that by going to 128MB. I know it's not a lot more, but it could save me the hassle of having to get a BTO configuration.

I found some other discussions about it, and people are saying that Core Image and Core Video will use it, so if any Apple iApps are using those technologies (which I should think they are), it seems like you might get better performance. From Apple's Core Image page (http://www.apple.com/macosx/features/coreimage/):
"And if you have a high-performance card with increased video memory (VRAM), you'll find real-time responsiveness across a wide variety of operations."

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