I purchased a high end HP d4995t Pavillion Desktop earlier this year.  I pretty much maxed out all the options on their highest end model.  When I got to "Wireless Networking" I opted for a pre-installed wireless USB adapter for $30 extra, it was that or nothing for wireless. 

I wanted to know what brand it was before I finalized my purchase so I called HP's sales number and asked.  They looked it up and said "Well its a wireless, you know, USB ... you just plug it into a USB port."   What brand?  "Umh ... A major one I'm sure."  I went ahead and purchased it anyway instead of going...