[THIN] Raid setups for citrix servers?

I'm curious how everyone does raid on their citrix presentation boxes.

I've always done them in a simple Raid 5 setup(with online spare) with
5-6 15,000rpm drives.
It makes for a pretty smoking fast setup, but it's not the cheapest
setup in the world.
I just got a quote for the new box I'm building, and the drives cost
almost as much as the server.

Anyone doing anything like raid 1 on the OS and raid 5 on the data?
Anything more exotic?

Thanks,
Jon

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