They say that cat RAID is a bad mutha-Shut yo mouth!- But I'm talking about RAID! We can dig it!
More serioursly.. are those 4 drives that will be in RAID 0 or are you being more conservative and doing RAID 1+0 (or even JBOD if you can split up the data)?
Are you doing a big RAM disk cache with the memory?
Yes your system is faster than mine. But mine is old enough to operate as a time machine so that I can be a roadie for Hüsker Dü. So therefore mine is *AWESOMER*.
Oh, and GET OFF MY LAWN.