KVM Disk "Survey"

I'm curious.

1. 15GB RAID10 Pure SSD Space
2. 50GB SSD Cached 7.2K RPM Drives
3. 25GB SSD Cached 10K RPM Drives
4. 50GB RAID10 10K RPM Drives
5. 100GB RAID10 7.2K RPM Drives
6. 20GB RAID10 15K RPM Drives

Pick one.