Wireless router needing wireless adapter

[jaso]

Here's the scoop: My sister and her husband recently moved and want to set up a wireless network connection. They own this (or something just like it; I know it's Netgear):

http://www.amazon.com/Netgear-WGR614-Cable-Wireless-Router/dp/B00008SCFL/ref=pd_bbs_1/104-7652354-7670365?ie=UTF8&s=electronics&qid=1187199292&sr=1-1

My question: If their modem is on the third floor and one of their desktops is in the basement (1st floor), will a USB network adapter like this work?

http://www.amazon.com/NetGear-WG111US-Mbps-Wireless-Adapter/dp/B0009N544A/ref=pd_sim_e_3/104-7652354-7670365?ie=UTF8&qid=1187199292&sr=1-1

Or would an actual internal wireless card be a better option? Like this:

http://www.amazon.com/Netgear-WG311-Mbps-Wireless-Adapter/dp/B00009YW8B/ref=pd_sim_e_2/104-7652354-7670365?ie=UTF8&qid=1187199292&sr=1-1

My only problem with the internal card (because I'd be installing it) is that I can't tell if the empty slots are PCI or PCI Express. I opened system settings and only saw listings for PCI Express slots, but that was only for three and there are five on this PC.

 

[jaso]

Anyone, anyone?

 

[jaso]

Any advice?

 

[CokeCola]

Go with the internal one if you have a free PCI slot. USB NATs eat CPU cycles.

 

[jaso]

Damn. I knew I should have told him to wait. My brother-in-law wanted something as soon aspossible, so I just told him to go with the wireless one in case he bought a new computer or wanted to use it with a laptop that didn't have wireless. Thanks anyway, though. Now I know for future reference.