iMac 27" refurbished 3.2ghz i3 vs. current 2.7ghz i5 for Graphic Art

Hello, I'm trying to figure out the best iMac for me. At the moment I work on a Macbook Pro 2.4ghz Intel Core 2 Duo running mostly Illustrator and InDesign.

I don't really understand Ghz other than more is better?

I'm comparing a refurbished 3.2ghz i3

against the current model (lower 27") 2.7ghz i5

I want the older one so I can set it to target screen mode for the Macbook Pro I own.. am I going to loose a ton of speed? Does the higher ghz of the refurbished one compensate for the newer i5 processor? The price is quite a bit cheaper than the new one. Recommendations? Anything that I am not considering?

Thanks guys

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