I use one of these. It works fine for movies and music streaming to my ht 2 floors away from my netgear 3600 router.

BELKIN F7D4555 Universal Wireless HDTV Adapter

it works as a network bridge and will allow any wired internet device wireless connectivity in 2.4 or 5ghz bands. It is also cheap compared to the buffalo.

Speed on wireless devices depends largely on signal, wireless throughput of router, network load etc. It's good to remember the specs with these devices are pie in the sky numbers and do not reflect real network performance.