Portable external raid - should I get 5400 or 7200 rpm?

Hi,
I'm in need of a portable external raid 1 for live data protection. I do illustration work in photoshop and I use bridge to access and view files and reference. I would like to write all my files and read all my files from an external raid 1 and I am wondering if I should get a 5400 or 7200 rpm setup.
My concern is read and write speeds.
My portable setup is a mbp 2.16 intel core duo. I'm thinking of getting the g raid mini 2.
Thanks in advance

Thanks for the response.
To clarify my question though -
1. I'm wondering if either will be fast enough to work off of - I'm planning on keeping the internal drive clean and all data would reside on the raid(so no incremental backups will be needed).
2. will the difference between 5400 and 7200 be worth the difference in price - ie. lag time or a noticeable speed difference.
Thanks

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