While it is not supposed to make a difference I have often it found it better to use the same maker on both ends. This does not seem to be as much as a problem with 11n, but if you have to buy new, I would look at the same maker as your wireless access point.
Also, it is getting more and more important to look for 32-bit or 64-bit, depending on what OS we are using - at least for a few more years, until 64-bit is commonplace.