Hi,
I bought a linksys router like the one you linked recently, not sure if its the exact same one, but its darn close if not.
The router wants you to plug in a direct ethernet connection so that you can "fiddle" with it directly. So I plugged in the PC that was next to the wireless router/cable modem LAN style (I was gonna do this anyways, its only my gaming PC's that need the wireless connection). Turned everything on, and everything was looking good. I wanted to do the easysetup security stuff, so I tried to fiddle with that, but it didn't seem to make a difference at that point.
I then went into the office, put in the PCI cards (I am not fond of the USB wireless adapters because of past history with my sister's wireless network that I set up using them, they seem to need "resetting" a lot aka full power offs of everything). I then saw that they detected 3 wireless networks in my house (2 of them netgear, so I knew it wasn't mine heh). None were secure. This really, really, made me want to secure mine. I could get on the internet at this point. I fiddled with the security page on the router from the PC directly connected, and got it to "go" at this point. At this point, I went back to the office to try to get these 2 back online, no luck. Very VERY annoying. The easysetup stuff isn't that easy. Tried this about 10 times... Pushing the button on the front of the router, blah blah blah. No difference. Finally I tried resetting the security AGAIN, and then directly input that massively long key "191724ajoasdh912479a (example)" into my 2 wireless PC's, and voila', I was back online. Perhaps I'm a moron, but I followed the instructions as best I could...
This older PC only gets 4 bars of connectivity, while my newer (and farther away) PC gets 5 bars... don't ask me.
Only thing that worries me is using different brand adapters from the router. I'm sure it'd work, but getting it secure might be tougher.
Good luck to you.