Shuttle has tested and recommends these 3 Mini PCIe WiFi cards for the SX79R5, SZ68R5, SH61R4, SH67H3, SA76R4 and the XH61V models:
1. Intel Centrino Advanced-N 6235 WiFi and Bluetooth
2. Intel Centrion Advanced-N 6230 WiFi and Bluetooth
3. Realtek RTL8191SE WiFi only
Mini PCIe Internal WiFi card kit
These were all tested with Windows 7 only. We will have to test compatibility with Mac Lion, Mountain Lion.
If anyone knows if drivers for these cards are available for Lion and Mountain Lion, please let us know in a comment.
CinlorTech's Blog 
Interesting device, but how about the linux drivers for this Internal Mini PCIe WiFi kit?
From the manuals I understood only Windows is supported.
Which WiFi kit are you looking for Linux drivers?
You can get both Intel WiFi drivers here: http://wireless.kernel.org/en/users/Drivers/iwlwifi
The Realtek RTL 8191se driver is here: http://wireless.kernel.org/en/users/Drivers/rtl819x
The 8192se driver works with the 8191se also.
Great info, Thanks for posting.
Where can you get the whole mini pcie kit for these cards?
Seems like you can only purchase the mini pcie card itself.
Well, I can get the Realtek kit from Shuttle. Have it on my website
under “Shuttle Accessories” if you want to order one. Other wise,
you have to order the card and the antennas separately.