joebshmoe said:your best bet is to get "raid edition" drives, which are designed for more usage regardless if you use them for raid or not (i.e. WD RE3 drive, NOT RE4-GP which is a green/low power model). the seagate 7200.12 drives are good, too, but i wouldn't be surprised if you are opposed to them...
I'm already up and running with 2 Western Digital 620gb drives. They'll be cloned so no worries about losing info again. :)