SDDs too expensive. Plus I'm not looking for a quick boot-up as most of the time the PC will most likely be in stand-by mode. 320GB is a waste of space because all that will be on the system drive is the OS files for XP and 7. Plus I want to keep it all WD so that if something goes wrong that's one less company I have to deal with. For example both my MB and VC is from EVGA and the monitor, DVD and Blu-Ray drives will be from LG. So I was thinking green would be adequate performance for the media drive (though kind of hesitant to get black or save money) and black for the 1TB, but I wanted to get an outsider's opinion.
I purposely didn't mention the 4th drive, because I already have that.
Nothing against Samsung, great company, but I want to keep the HDs all WD. I was considering Seagate, but after learning that they had some problems with their HDs recently, I decided to stay with WD. Thanks for the replies! Much appreciated.