I don't have any spare ports on the router (printers, PC, etc), and I already have a 'full' 4-port splitter (xbox, digital tv, blue ray player, and sonos system). The sonos bridge has 2 ethernet ports. Maybe I can plug a NAS directly into it... that's what I wanted the drive for anyway. But I also want the rest of the network to access it as well. Not sure if this will work.
Just daisy-chain another ethernet switch into the system. Cheap 5-port models are only $20-30. Although for the number of devices you apparently have plugged into the system, you might want to spend the money for a proper 16-port switch
and then use the router as a gateway device only. The overall network performance will probably be better, and the router will live longer since it won't be producing as much heat.
He who laughs last, laughs first next time.