Re: wireless networking help!..
if you buy the second one (adsl modem and router in one) you won't need to buy the router in the first link. and when you say you need to buy a modem, I ask, didn't your isp provide a modem for you when you signed up for internet access? if so, then you would need to buy the ones on the first link, since it comes with a reciever too. then buy additional recievers for any other computers you may want to connect to the network.
but, if your isp already provided you with a modem...you won't have to buy one.
When all else fails...Ham Radio!
I still have the same old HP DV9700T laptop I've had for years...still kickin'