My recommendation would be going wired. I know there are several discussions about lowsy throughput of the Gen3 box. However, wired is typically faster and much more reliable speed. I would even recommend Cat5e cables. They are good enough for 1GE if you don’t have the need for excessive lengths in your house.
I personally have my Gen3 hooked up wired using a 200Mbit PowerLan adaptors and I stream 2.5h videos with 20G without any problems.
They both are able to stream HD off the NAS at the same time, no problems.
The largest of files, usually in mkv format will stutter abit on the wireless G, so I’ll get to wiring that one too… eventually
I plan to add at least one more WDTV, which i suppose will really test the router’s throughput, though at that point I might be hitting the wall as far as output from the NAS