Best wireless router & cards for high-speed cable connection?

[newbee <wireless@xxxxxxxxxx>]

I have just received a new Dell 8400 WinXP Media Center system (3.4
GHz, 2 GB RAM, TV tuner card). I have a fast (~4600 kbps) cable
connection (Adelphia internet and TV).

My main need is to connect my old computer, now in an adjacent room,
to the Internet. Am guessing that the best way is through a wireless
router. The walls are not thick, and should not be a problem.

If a wireless router is the best solution, what is the best one? There
seem to be three good deals available online, but am not sure which,
if any, would be the smartest purchase:

ViewSonic 802.11b/g 125HSM Wireless Network Router (Mfr# WR100) » only
$29.99 Shipped

D-Link DI-524 802.11G 54Mbps Wireless Cable/DSL Router 4-Port Switch »
only $19.99 + Free Shipping

Buffalo Airstation 54MBPS Wireless Cable/DSL Router (Mfr# WYR-G54) »
only $18.10 + Free Shipping

Also, what card(s) would be needed for both computers?

Thanks for all suggestions.

P.S. Second question, please: What would be the best way to not only
connect that 2nd computer to the Internet but also to connect the TV
in that room to my main Media Center computer? Dell offers a solution
(http://snipurl.com/ewgq), but the $399 seems excessive (perhaps I'm
wrong, of course).