90% of the time the Gkill's are going to be the cheapest in their speed and CAS range. However they have tall heat sinks which, if you scour these boards, you will find a lot of people having problems because the tall heat sinks won't let the modules fit under the bigger / better / CPU coolers. Not an issue if you aren't going to overclock and use a high performance air cooler.
The X58 chipset wants you installing RAM modules in groups of three....if you springing for the X58 option, I think you can forget the 1 GB modules and I'd say you are looking for either....
3 x 2GB
6 x 2GB
3 x 4GB
6 x 4GB
Most people are gonna be just fine with 3 x 2GB....note that using up all the RAM slots will sometimes require you to tune down your OC or timings to maintain stability.....since money's not a big deal and you're willing to pay $100 over MSRP for a GFX card, I say why get tightfisted on RAM ?
But for just $20 extra, going for the CAS 6 seems a no brainer to me .....the cheapest CAS 7 is $190 but their timings are a bit slower at 7-8-7-24 and they do have those tall heat spreaders....again, hardly seems worth the $10 savings.
Can I ask why you recommended this model and not the G.Skill Trident 6GB DDR3 2000?
The price difference is only 20 bucks more. Is it because your has a 7 on CAS Latency and the Tridents have a 9?
1- Yeah, because a lower CL means a more faster RAM.
2- You won't see a big difference between 1600MHz and 2000MHz, more if that 2000MHz are CL9. Maybe are only $20 more, but don't have sense spend more money in a RAM that isn't as faster as the 1600MHz and even when you can get the same speed OC the 1600MHz RAM.