sry, that link's not opening up for me.
Here's a list of Bluetooth dongles from NewEgg. http://www.newegg.com/ProductSort/Su...&ATT=Bluetooth
Doesn't matter if it's USB or internal, as long as it's a radio device, it will pick up other bluetooth devices, including other bluetooth connected hard drives, phones and laptops.
Honestly, i would recommend just ordering the internal part for your Dell - it's quite easy to install, and if it's anything like my older Dell XPS, the internal card fits into a little slot near the battery. Just remove the battery, and pop the bluetooth device in. did it myself - very simple.