Looking for compatible NAS device for WDTV

I have the 1st gen WDTV (not live).  I want to get a NAS device that I can simultaneously have connected via USB to the WDTV but still have it connected to the network for my other computers.  Is there such a thing?  Any recommendations, under $200?

Be aware that most of the NAS USB port are used to connect another drive to the NAS, Also, because of the WD TV Gen 1 configuration, this might not be possible at all.