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ok so we have eliminated raid6 in favor of 50.

now what about 50 vs 10 or 0+1?

Do you know any good benchmark sites that compair raid speeds with cards?

I'm not quite as concerned about very high sustaned transfer speeds. It's much more important for IOPS.
Its for a Postgre server.

I have :
8 Seagate Cheetah 15k 73gb hdds
1 Adaptec 3805 RAID 8ch SAS controller.

What would be faster:

two 4 drive raid 5s in stripe = raid50
or
one 7 drive raid 6 with a hot spare?

faster for reads, and faster for writes?

Is there another option for very fast random read and write ios ...