The Maxtor is out of warranty. The two Raptor X's are fully warrantied until 2013. The regular Raptor is warrantied until 2011.
What drives should I keep? I don't want to do any type of RAID setup.
I'm thinking, keep one Raptor X 150 gb for Windows + games, and use the Maxtor 300 gb for storage (mostly pics and work-related stuff). I'd like to keep BOTH the Raptor X's, but the extra 150 GB of storage from the Maxtor is nice, plus it runs a lot quieter and cooler. I only have room in my comp to store 2 hard drives, because one of the 3.5" slots is taken up by a floppy drive.
I would be selling the other Raptor X and the Raptor. I don't feel like buying any other hard drives for the time being, because I don't need more gb space and I'm lazy.