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That depends on what you're doing. A faster processor definitely won't help you write a document quicker 😉 We need more details.
 
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Do agood bit with Ilife (photos, movies) and run Parallels a good bit. Rip many movies with Handbrake.
 
Do agood bit with Ilife (photos, movies) and run Parallels a good bit. Rip many movies with Handbrake.

2.8 GHz it is then. I'd recommend the 3.06 GHz CPU to anyone doing intensive engineering or research grade applications.
 
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