Peter,
Yes, unless you want to connect your Mac Pro direct to the TV then some kind of additional hardware will be required.
The spare disks on the Mac cannot be a NAS as such, but you can make them network shares (afp or cifs - smb to the Windows world) and therefore visible to the likes of a dune.
An alternative to the Dune is an "old" apple tv - the grey v1 not the black puck. I run one of these with a Linux distribution and XBMC (rather than the stock Apple OS), this enables me to stream all manner of media. There is also a nifty iPhone app to control it all.
Nick
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