I suspect you can do better than the Actiontec offering.
For a start,you will get better performance with a dedicated wireless PCI card for your PC than an external device connected by USB. Using USB inevitably takes resources from your computer whcih a dedicated card would not need.
Most routers that have wireless capability will also allow up to 4 wired ethernet ports too. If your PC is wired up now, that might still be the best option and cheaper than buying a new wireless card for it. That way the lappy has wireless mobility, the desktop doesnt.
You do not want a combined wireless router & ADSL modem. That would not work.
Linksys seems to be a popular make. Try this for size:
router:
http://www.linksys.com/international...oid=6&ipid=533
If you must have a network card for your desktop then you'd want this
http://www.linksys.com/international...oid=6&ipid=521
Note i've shown the speedbooster range. You could downgrade if you are unlikley to do much file sharing between lappy and desktop. Even the slowest 802.11b wireless system would pass data faster than the fastest current ADSL/cable broadbadn offerings