How about setting up a pc with some disks in it in RAID config, and then run OpenFiler on it? OpenFiler is free software based on Linux, and is capable of acting as an iSCSI target. You can then link to this RAID pc via your LAN. (iSCSI initiators are included even in Windows) The biggest advantage is then that this 'external' RAID setup will turn up as a local disk on your PC.
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Riocar 80gig S/N : 010101580 red
Riocar 80gig (010102106) - backup