I'd go with raid 1+0 ... Be a shame to have that much cpu power and become I/O bound.. This way you've got 4 disks feeding the cpu's instead of 2.. Better performance than raid 5, and only 2 more disks than your current config.
If you have 8 GB of RAM and 4 GB of database, you would only become I/O bound if write a few hundred blocking commits per second to the disk*. In that case, having a battery backed RAID adapter with write cache enabled is a much better way of improving performance as going from RAID 1 to RAID 1+0.
*Presuming the OS has a sane disk cache or is 64 bit.
Jochem
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