You could always add SSD's to the OP they are a very fast storage medium. But different to a HDD.
finally I'm useful
my only pause for SSD, is there fail rate.
now maybe they are a lot better then they used to be, but as far as I know they have a much higher fail rate then a HDD.
theres also price.
but if they have come down in fail rates I would love to know so I can update my brain ^_^