What should I be looking for to maximize wireless local streaming performance?

Hello all,

First of all, I'll start by saying that I'll admit that although I'm savvy enough to build my own PC and install windows without all the connectively stuff, my actual knowledge of networking and system ops is limited to about what is shown on the average LTT NAS video.

I've reached the point where I really don't want to be keeping track of my growing collection to external hard drives and now I'm looking to spec a setup for a NAS.

One of my main goals for the system is to be able to access my content (mostly video content) wirelessly from anywhere in my home as opposed to being wired into the NAS. My question is, what does it actually mean in terms of spec-ing the system?

I figure that it probably won't be responsive as wired, but if I can get "better than youtube loading/buffering speeds" when scrolling the header through my content, then that's good enough for me.

Thanks!