I know the question in the title is a bit broad.
I'm a little confused about NAS storage. I have a Macbook Pro, and I want to set up a NAS Raid box that will be attached via ethernet to my router. I want to then use Time Machine as the backup software for the Mac. Will any NAS do this as long as it has drivers for a Mac? The main thing is I don't want to have to plug in the laptop for the backup-I want it done wirelessly, and I don't want to spend $500 for the 2 Gig Time Capsule. I want something like a 2-4 gig RAID 1 setup.