the only thing about a pci slot type card is that if the desktop unit is inside a cabinet and you close the door, or push it agaisnt the wall you will effectivly cut off it's range or "shape" the signal which can affect your range. At least with the other type the ant is extendable. I install these things everyday and for the most part both are simliar, the usb type are less headaches and and extend via the cable. Now for a sad part in all this. get one from wally world then if you have problems you can exchange it usually with no questions asked. unplug, exchange, replug in. my 2 cents
jd