I got a GPS board in the mail, with PPS output, as well as NMEA output over USB, RS232 and Bluetooth. The plan is to build a basic NTP stratum 1 server to use at home.
Someone wrote a detailed review of this board.
A couple of photos of it on my workbench:
You can view the NMEA data on the terminal window, in this case it was being read over Bluetooth, the USB cable was just providing power.