Hmm, let's see.
I game alot actually. Also, I download a ton of stuff. Currently, I don't stream that much but am looking into streaming the yankees game from YES network this baseball season as I am no longer in NY and getting YES Network is just out of the question in the south on a local cable company so alot of streaming (besides the simple YouTube stuff and music streaming I do now) could be coming in the future.
As for wireless, not so much.. However, I want it to be there in the even it is needed as from time to time it is most certainly used. My *main* PC is a self built rig that I have sunk slightly over $3,500 into so far so I am trying to improve it's performance in any way possible as well with this upgrade.
One of my main reasons for upgrading is I am changing all my cabling out to CAT6 and would like to take advantage of it and run Gigabit. Also, several of the reviews I have read have praised the higher end routers for much less latency and even faster downloads etc... I would like to accomplish both of those things if possible.
I Hope that sheds some light on what I am trying to accomplish.