No, that is not overkill enthuzist. That just means that you are sick, and know what real networking equipment is, and how to do a network properly. A mix of Wifi & Wired with using Gig switches, allows you to not only have options, but allows the best option out there as you also understand. I would not have it any other way of going backwards in placing a 100meg switch on my network. Never have I had any problems with streaming using the Netgear GS-108 that I use for the wired portion on my network. When I had a 100meg switch on it, streaming would crap out, because it could never handle the packets properly, let alone multicast as some on this thread seem to think that 100 meg switches are the right way, but actually the wrong way to do today's networks.
BTW, if you get tired of those 2900's, you can send them my way. I am sure my wife would have a fit on that one.