I'm not sure what your issue with wireless and streaming was (or getting bumped off?!). That simply shouldn't be happening with modern protocols, unless you live in a faraday cage. Even 802.11G is faster than your 30Mb/s cable company. You also shouldn't see any lag whatsoever being created by your wireless connection.
In a perfect environment where you are the only one using a specific band of radio space that would be the case. I live in an upper scale suburb where there are quite a few families that have internet. From my house I can see 17 different networks that are all trying to use the same 12 bands. And now that everyone has G / N / AC all running to get the most bandwidth, it is a basic war for who has the most amount of gain on the signal. I gave up and just went with a wire for critical connections as wireless around me is just too iffy. I could have gotten a +30db antenna in a quest to over power everyone else, but I know it's just a matter of time before someone else does the same thing.
