I am no UNIX geek and would like something that doesn’t need to be hacked to get it working.
Unfortunately the built in media servers that ship on off the shelf NAS devices are somewhat lacking e.g. don’t support search. In addition you become dependent on the NAS vendor to resolve any issues you have. Mod’ing a NAS box really isn’t as tough as it sounds and there are setups that mean you don’t need to know a whole lot about linux. Check out the MSS and NSLU2 install guides at http://wiki.fireflymediaserver.org.