I would go with the second set, the Ripjaws X Cas 8 modules.
The Corsair Vengeance memory kits are also good, I have a 8GB (2x4GB) set of DDR3 1600 Cas 8 myself. But the heatspreaders are really to tall and they interfere with some heatsinks, plus they are cheaply made (the heatspreaders). If I could do it all over again I would of bought a kit of Ripjaws.