Getting new RAM

that is a nice although the picture on the crucial site is a bit confusing.
the once on the bottom (pic) is the one you actually get.

1600mhz at cas 8 is pretty decent and the price is good too
 
The top picture is of the new addition to the Crucial Ballistix lineup- it has an inbuilt thermal sensor (2x2Gb review here). For that little addition to the modules you'll be paying a hefty premium.
From a value for money perspective, you're better off going with the standard Ballistix(yellow heatspreader) modules -same specs 1600 @ 8-8-8-24...assuming you're quite happy to stick with Crucial RAM
 
Use their configurator
here:http://www.gskill.com/configurator.php
Then plug in the appropriate model number in the search engine of choice.
i.e. "F3-12800CL8T-6GBRM review" -also throw the 3Gb and 4Gb part numbers (-3GBRM and -4GBRM (in this case) into a search as well since reviews of either will suffice.
There is very little variance in RAM performance, so most reviews tend to concentrate on overclocking results- getting to a higher bandwidth for less expense- pay for DDR3-1333, clock it to -1600 type scenario.
G.Skill, like Crucial, Corsair, Kingston, Mushkin and Patriot (to name a few) offers a lifetime warranty

EDIT:
What does the thermal sensor do?
I've you had read the review link I posted you wouldn't need to ask
I'm not going to be overclocking, so do i need that? Also, I found another one from crucial: http://www.crucial.com/store/mpartspecs.aspx?mtbpoid=608F845CA5CA7304
and I'm wondering if more memory is better, or the speed.
More is better if you are using applications that can utilize it
Also this one is much cheaper, but seems to have about the same specs:http://www.crucial.com/store/mpartspecs.aspx?mtbpoid=593E4A88A5CA7304
You mean the same modules I recommended in my last post...
From a value for money perspective, you're better off going with the standard Ballistix(yellow heatspreader) modules -same specs 1600 @ 8-8-8-24
Also, im using a asus p6t deluxe v2, so I don't think ram at 1.6v is compatible.
Maybe you should read your motherboard manual.
Chapter 2, page 13:
"According to Intel CPU spec, DIMM's with voltage requirement over 1.65v may damage the CPU permanently. We recommend you install the DIMMs with a voltage requirement below 1.65v"
 
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