Trying to pick internal HD's for a new Mac Pro. Do the SATA 600's give me anything over the SATA 300's. Probably going to set-up an internal software RAID of two or three, till I can afford a decent external RAID. Does the internal data transfer speed max out at some level that buying a SATA 600 drive would be a waste? Also, I have two existing 20" Apple LCD Monitors, probably 5 years old that i need to use. Is the appropriate adapter simply the MDP to DVI connector? They're currently connected to a G5. Thanks.