Yo Nik, was this in one of your locallhy hosted servers?
Have a bash @ Linux software raid, I think on a lot of the recent debians and ubuntus its fairly easy to set up on the installer without dicking about.
Note it aint perfect - but still a step up.
Next time over I'll explain more if you're interested.
I'd suggest a cheaparse SSD as another option, but I just had one die on me at work (32GB SUPER TALEND brand).