Macbook Pro: Dual Core i7 vs. Quad Core i7 for iMovie

Hi-
Debating whether to purchase the 13" MBP 2.8 GHz dual-core i7, or whether to pony up $700 more for the 15" MBP 2.4 GHz quad-core i7. Another consideration would be whether to install 4 GB extra of RAM to get 8 GB at the cost of $180.
Critical question here is whether video editing in iMovie would be OK with the dual-core i7 plus the extra RAM, or whether the quad-core is really necessary. Anyone have some thoughts on this? Thanks in advance.

Ralph has pointed you in the right direction regarding RAM. Both MBP'a will do the job, but I suspect the 15" machine will have the edge. That aside, another consideration is the screen size it self. Larger is better to put it simply. I have 17" MBPs for that purpose. That becomes a very big price jump, but I'm spoiled.
Another factor to consider in working with video, is storage. Video files can become very large. Think about external storage and data flow for various types of connections. Another advantage of the 17" MBP that it can accept and eSata connection (with an appropriate express card) where as the other MBPs cannot. esata is significantly faster than Firewire, which in turn is faster than USB. Naturally the enclosure will have to be eSata compatible. Faster yet will be the Thunderbolt connection, but as of now I am not aware of any compatible enclosures.
Ciao.

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