I have Linksys WRT54G Wireless-G Router like this:
http://www.amazon.com/o/ASIN/B00007K...062255-3471949

I currently have comcast but will have DSL on Jan 8th.

Is there a pro and cos w.r.t distance bewteen wirelses PCI card and a
USB wirless adapter? The PC that I need to make wirless capable will
be downstairs in opposite direction from the wrireless router
upsatirs.

Should I get linksys brand since my wireless router is Linksys?

BTW, the PC that I want to make wirless capable currently has XP
installed. The plan is to put Linux and ...