I have an (Early 2008) Mac Pro in standard configuration. The hard drive is just about full and would like to add a second internal hard drive. I have read that some people choose to keep just the OS on one hard drive and everything else on the drive. Is this the best way to go? Which hard drive would the applications go on (with the OS?)? The main use of this machine is for graphics (Adobe CS3 and Aperture). Any recommendation of brand and model of hard drive would be good for this application?