MacBook Pro 15" - Which Model ? 2.4 2.5 2.6

Folks,
Im going to buy a MacBook Pro 15" next Sunday and I would like to know if there is any significant difference between the models - 2.4 2.53 and 2.6.
I would like to best cost/benefit , considering price an important variable for my selection.
In fact I would buy at Apple Store and get 8Gb RAM, but not possible considering my location. I live in Brazil so this is an opportunity to get a Mac in US.
CTV

Comparison is here: http://store.apple.com/us/browse/home/shopmac/family/macbookpro?mco=MTM3NjU5MzU
Besides the obvious CPU speed, main differences that stand out are: i5 vs i7; 320 vs 500GB HD size; and 256MB VRAM vs 512.

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