Confused over compatability with AMD and mobo

I am almost finished building my first rig using the AMD II X2 555 BE C3. My mobo is MSI 785G-E53. I impatiently await delivery of my memory G.skill ripjaws DDR3 1600 F3-12800CL9D-8GBRL (4Gx2) to complete the build. I am anxious to test the system now and to do so I am tempted to go to Frye's today to pick up a 2Gx2 Patriot mem kit of DDR3 1333MHz DUAL G2PGD34G1333ELK http://goo.gl/euzxv (This kit is only $30 less $25 rebate.)

The G.skill site says that mem test voltage is 1.5V and does not include my mobo on the recom. list. http://tinyurl.com/3cvuvzu It strongly recommends that for an AMD platform, to follow the voltage/timing as specification to stabilize your system instead of select AUTO/Default.

The Patriot mem is rated at 1.67v. http://tinyurl.com/3wxmrbs

I do wish to try overclocking and am concerned about how each mem set would work with my CPU and mobo and if they would beneficially work together or best alone. Suggestions greatly appreciated.
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The two kits of ram aren't likely to like each other much. If the Patriot ram requires 1.67v just to run 1333 there is little chance of it managing to run 1600.

Meanwhile the g.skill ram's ability to run 1600 at 1.5v means it has a decent chance to run quite a bit faster at higher voltages.

If you can, I would wait till the g.skill ram arrives, otherwise you're going to be stuck with a kit of ram you can't really use.