you will see tremendous improvements, with a array of that scale and complexity i would highly recommend you purchase the keys. the results with raid 5 are supposed to be just as impressive. i was wondering, is it possible to run a raid 0 set across all three controllers as a bootable array? i know that arrays can be spanned over several controllers, just not sure if they are bootable or not.
i would love to see some pics of your rig!