This is not a streaming server. It's simply a NAS solution. The HTPC's simply have the drives mounted in NFS. With 3 HTPC's in the house and also serving as a backup / storage solution with other systems in the house it was very easy to make the C7 hiccup.
Also worth noting- you don't need Gigabit bandwidth for HD content unless you're streaming more than 3 or so streams. I manage just fine with 100 Mbit on my switch. You should use the bandwidth they use for ATSC as a good litmus test for what's honestly needed and if you're having problems, perhaps it's your streaming server or other hardware introducing latencies, including making an unsuitable processor do softraid.
It's also worth noting that I never once said that it did not have it's applications, for example that C7 system made for an excellent wireless router / firewall / torrent client / personal webserver with some additional hardware, it wasn't the most price practical solution but never the less I had it so I put it to use. Had I set out with those purposes in mind though I would have just picked up a cheaper linux based router which has a lower power consumption and is cheaper to purchase.
It's also worth noting that you're not doing a normal thing that most people doing NAS setups end up doing... ;)
Just because YOU find it unsuitable doesn't make it so for all other applications. If that were the case...heh...you'd find a hell of a lot of things deemed that way by me and you just couldn't use 'em. >:-) :D