Actually, the easiest solution is to get one of the new dual band AirPort extremes. Run one band as 5 GHz N only, and run the other one as 2.4 GHz Mixed Mode (N, G & B). Go ahead and give them two separate names so you can specifically assign devices to whichever band you want. If you have two N devices that are going to talk to one another frequently, I've found that it is better to attach one of them to the 5GHz N and the other to the 2.4 GHz Mixed, otherwise during any given transfer the two devices are competing for wireless bandwidth with one another. By putting one of the N's on the mixed mode (and potentially slightly handicapped) band the contention is removed, and the result is better throughput... even if there are some G devices attached (but not currently doing anything).
I really dont get why people want local storage. I had a WDTV with USB and to add something new you had to unplug the drive, plug it into a Pc then wait for the file to copy, then plug it back into the WDTV. Why would you want to do this when you can just stream from the network...
imo local storage is bad files management, files should be on a netdrive with an external USB drive backup that is store OUT of the house (work, family, friends,...). I have two 1TB USB drives with one at work and one at home and I do backup rotations with them.
Because streaming is not perfect. Files stored on the ATV do not require the network to perform at any certain level. If everything was wired, then streaming wouldn't be a bad thing. Wireless is just too finicky, even with 802.11n.
I only have to hit the "Sync" button in iTunes all that's it. I don't see how this is difficult at all.