I would NOT recommend the Muskin 12GB kit, as it is meant for triple channel setups. Your AMD build only supports dual channel, so the extra 4GB would actually slow you down by kicking you to single channel performance.
^ +1. AMD systems will run in dual-channel mode on 2 or 4 RAM sticks only.
What purpose will you use this PC for? If it's for pure gaming then 8GB is adequate and quite future-proof for a few years.
For the other two kits, I think Kingston's is quite decent. I have 2x2GB 1600MHz kit, set it at 7-8-7-21-1T timing and it works flawlessly.
Haven't tried Patriot's, though.