Hello, I'm looking at doing a simple NAS set up. I'm new to this sort of thing, so bare with me please. Really, I'm in the market for a new router, and I figured that while I'm replacing my router, why not get something where I can do a simple NAS setup. I have a 500GB USB HD that will work just fine for the storage end. What I am really wondering; is it worth it to spend the money on an AirPort Extreme to fill out the router end of the set up, or would I be just as well served (or maybe better served) with something "cheaper" (Linksys, Netgear, Medialink, etc.)? FWIW, I have a MacBook Air, Apple TV, an iPhone 5, and I do use my ATV for streaming TV shows and music videos quite a bit. The HD space on my MBA is quite limited, so any set up that would allow me to stream media effectively from my external HD to my ATV without having the HD directly plugged into my MBA would be ideal (though I'm not sure that is possible since anything streaming to the ATV has to run through iTunes?).