Optimal NAS network setup.

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I just bought a new Linksys WRT610n and want to get my network file storage situation settled. I have two 500GB drives that I was using in Raid 1 with a cheap PCIe raid card. The computer it was in is being used elsewhere, so now I have a few options on how to set this all up:

• Buy two USB enclosures and connect the drives directly to the router.
• Put the drives and card in a spare eMachines (AMD 64 - PCIe).
• Connect the two drives directly to the mobo.
• Connect the two drives directly to the mobo of a spare Dell Poweredge 750 (P4 - no PCIe).

I'd like to use some of the space for backups (Time Machine) and the rest for media storage (some of which is valuable). I also have a spare My Book 250GB drive that I would like to use with this setup as well. What's the best way to get all of this setup?

The computers accessing the storage will be:

• MacBook Pro (Wireless N)
• PowerBook G4 (Wireless G)
• AppleTV (Wireless N)
• Linux PC (Powerline Adapter)