I say go with RAID 5, on a controller card.
Mirroring just gives you backup, and you lose half your diskspace. It offers no performance benefit, and actually the computer might have to work harder to make sure the drives are in sync.
that is not true. mirroring gives you double the read speed and half the write speed. RAID5 gives you less than half the write speed.
that's why i said if your database app is mostly selects go for mirroring. the OP said his app is about 50% select, so i say mirroring is a good choice.
and hey, what's wrong with having a backup? the computer doesn't work any harder, it's all handled through the RAID controller card anyway.
-jsd-
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