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SAS 2.5" - Better off with 10k rpm drives and half the spindles or twice the spindles and 7200rpm drives?

Discussing spindle count vs. rpm for overall performance.  Building a HP ML350 G6 ESXi server that uses 2.5" SAS drives.  

For slightly less money than as using 10k RPM hard drives, I can get twice the drives/spindles/capacity if we went with SAS 7200rpm drives.

I would believe that twice the spindles will increase IO performance, fault tolerance and double my storage capacity.  The only downside seems to be less free bays for the addition of drives in the future.

Is there anything I'm not considering?
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chuckyh
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Adding drives does not increase fault tolerance, you have more points of failure with more drives. The downside is with more capacity you will add more guests which means smaller slice of IO for each guest.
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(Load balance between EACH disk in the RAID set, sorry for confusion above)
Plus, in scenario above, you have increased reliability because each disk mirrors the other.  You have ZERO data loss in event of a drive failure.   WIth the 10K single disks, you have 100% data loss in event of a failure.

Easy decision, right?
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