Fully respect both your thoughts, as I am a total newbie, but check this test out comparing 2400Mhz GSkill Trident X vs 1600Mhz GSkill Ripjaws Z was hardly any difference on an i7 3770k and Z77 mobo.
http://hexus.net/tech/reviews/ram/38613-gskill-tridentx-ddr3-2400-ivy-bridge-memory/?page=7
"You are here: RAM Reviews 5 Review: G.Skill TridentX DDR3-2,400 Ivy Bridge memory
by Tarinder Sandhu on 2 May 2012, 15:30 3.0
Tags: G skill
Final thoughts and rating
Now available to buy from your favourite retailer, Intel's 3rd Generation Core chips are sure to attract the interest of the enthusiast. The chips' release is also an opportune time for memory manufacturers to launch optimised dual-channel kits, and G.Skill has done just this with the all-new TridentX DDR3 range.
Starting at a lofty 2,400MHz and reaching 2,800MHz the TridentX family looks good on paper. Delve a little deeper and the loose timings and 1.65V operating juice - both necessary evils at this end of the spectrum - rear their ugly heads, as does pricing, which is reckoned to be at least double that of regular DDR3 memory that runs at 1,600MHz.
Genuinely high-end products are released with the lure of exceptional performance. Our benchmarks show an 8GB (2 x 4GB) TridentX pack of DDR3-2,400 memory to be barely any faster, if at all, than well-tuned DDR3-1,600 memory. The explanation for what seems like a performance anomaly is actually quite simple: Intel's recent chips integrate smart, efficient caches that blunt the hoped-for benefits of running premium RAM.
The G.Skill TridentX 8GB DDR3-2,400 memory pack does exactly what it says on the tin, with utter stability, but the very architecture of the latest Intel processors does it no favours, especially as it costs over twice as much as memory that performs just as well. We're struggling to find compelling, obvious reasons for recommending it, frankly."
If there's something they haven't thought of, let me know with some links or info/proof please, as I am soaking all this in, and love reading about all this cool stuff.
Otherwise, looks like I'm going to go with GSkill 1600Mhz RAM...
thanks!