The lower the timings the faster the memory. So the second choice is best. The Patriot I would stay away from as it needs 1.8v to get 9-9-9-24 meaning the RAM is lower quality modules. The 3rd choice is slower than the second by quite a bit. 1.65v is perfect for DDR3 1600 and the 7-8-7-20 timings are great as well so go with 2.