If you are going to get it for other application, that is fine. Beyond a slightly larger range than 802.11g or 802.11a routers, you won't see much benefit because there aren't any adapters for the 360 that will work with 802.11n. So you'd be using 802.11g adapters with your 802.11n router.
I don't know when any would be coming out because 802.11n still hasn't been finalized last I checked.