using old computer for NAS

I have 4 250bg IDE HDDs sitting around gathering dust. I investigated NAS devises but the cost was prohibitive.
I'm thinking of buying an old COMPAQ Evo D300v, upgrading to Win XP, installing a VIA VT6410 UDMA/133 IDE RAID Controller PCI Card, installing the 4 harddrives, attaching it to my home network, thus having "NAS" storage for for about $75. Have I missed something, or should this work?
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Correct me if i'm wrong but i believe that raid card only support two drives but yes in theory this will work :-)
Correction the card can work with existing on board ide ports

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RAID 5 requires a minimum of 3 drives while IDE supports only two IDE devices per controller
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