I see that you already have a wireless router. If your current router is not a dual band wireless-n router, you might want to consider upgrading, and I would suggest either a Buffalo or Netgear dual band wireless-n router. While many folks hereabouts have Cisco/Linksys routers and swear by them, industry experts generally rate Buffalo and Netgear as being vastly superior. (For the record, I have a Netgear WNDR3100 gigabit dual band wireless n router - a few years old, and superseded by such models as the WNDR4500, which is rated "Best of the Best by Maximum PC magazine)
In my household,there are many devices connected both wirelessly and wired -- three wireless printers, 4 TiVo DVR's (using TiVo Wireless-g USB adapters), 2 desktop computers using Belkin USB wireless-n adapters, a PS/3 and a Wii, both wireless-g, 2 laptops with USB wireless g adapters and an HP desktop with builtin wireless-n router, along with TV's and Blu-ray players, both wired and wireless. The Netgear router handles all with aplomb. Most use the 2 GHz radio, while my primary PC uses the 5 GHz radio and a Netgear WNDA3100 dual band wireless-n USB adapter..
Almost any brand of USB adapter should work for you, from Belkin, Cisco, D-Link, Netgear or TrendNet. To keep things simple, if your current router is wireless-g, then get a wireless-g adapter. If it's wireless-n, get a dual band wireless-n USB adapter (even if the router is single band,aa dual band adapter will work fine).
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