1600 (DDR3) worth it/supported on GA-P55A-UD6 or just 1333?

Hi, Crew-
I just ordered up the Gigabyte GA-P55A-UD6 from newegg (to match with my i7 860):
http://www.gigabyte.com.tw/Product [...] uctID=3234

You'll see under Specification that the only supported memory standards are:
"DDR3 2600+/2200/1600/1333/1066/800 MHz memory modules"

Does this mean 1600 DIMMs aren't worth it (though the difference in cost is trivial)? Or can I still achieve 1600 (2x2GB) if I overclock only the memory (I wasn't planning on OC'ing the CPU or anything else)? Either way, I would get the lowest CAS-rated chips available (at lowest voltage possible), whether 1333 or 1600.

I know there isn't a HUGE gain from 1333 to 1600 necessarily (e.g. http://www.anandtech.com/memory/sh [...] i=3589&p=1 ).
And I see others have had this question, too (e.g. http://www.tomshardware.com/forum/ [...] d-gigabyte ).

One recommendation seems to be the G.Skill Ripjaws F3-12800CL7D-4GBRH at newegg for 115 bucks (7-7-7-24-2N at 1600 & 1.6v). ( http://gskill.us/forum/showthread.php?t=2052 ) If I picked up this kind of memory, could/should I run it at 1333 instead of 1600 but with ultra-low CAS ratings/6-6-6-6-18 or the like? All things equal, getting 1600 memory and underdriving it at 1333 would treat the DIMMs better, right?

Anyone have any advice?

[and please forgive me if this conversation has been had already--I can't seem to find the search feature on this forum.]

Thanks!