According to Legion Hardware the Patriot Gamer 2 DDR3-1600 is the best value on RAM going.  They back that claim up with the Gamer 2 1600MHz @ 9-9-9-24 costing only $53 and keeping up with kits costing almost twice as much.  They also managed to tighten the timing without lowering the frequency, on an i7-920 they hit 8-8-8-20 and with an X6 1100T they managed 8-9-8-20 which is very impressive for a kit costing less than $60.  The full review covers two 8GB kits, the Viper Xtreme Division 2 “PXD38G1866ELK” and the Patriot Gamer 2 “PG238G1600ELKA".  Don’t spend more on RAM than you have to.

"…when testing we found that the relaxed CL10 timing of the Ballistix Sport memory made it much slower than the Patriot Gamer 2 memory which uses CL8 timing. Therefore in short we believe that the Patriot Gamer 2 is the best value DDR3-1600 memory money can buy and in fact we would go as far as to say it’s the best value 8GB DDR3 memory kit available period."

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Memory