other options you really need to consider...
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231351 <- if you want cas 6 and $30 cheaper then the corsair's.
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231321 <- good lower voltage ram, will have lots of head room with 1.35v for DDR3-1600 cas7 ram.
http://www.newegg.com/Product/Product.aspx?Item=N82E16820231279 <-ram im currently running in my i7 860
Gskill is more price/performance oriented and mushkin is just all out performance. both ram kits for cas 6, well timings and speed being equal. your not going to notice a $30 increase in performance on the corsair's. they might be a 2% difference between the two stick, could go either way. corsair could be higher or gskill could be higher. i have nothing agianst corsair what so ever, love the company for great products like the 650tx im using. all companies look at the bottom line and what makes them money. when building a pc, my bottom line is highest performance for least amount of money. it just so happens gskill does have hidden gems in the line up, you just need to find them.
all manufacturers, ocz, corsair, gskill, crucial, have good warranties and good RMA turn around time. the only ones i have had to use rma on is corsair and gskill both times got back to me within a week.
For the record timings = cas on ram, so lower timings+high speed= way to go. though you need to look at the voltage required as well since IMC's are a bit more sensitive now to voltage from ram. you can have ram voltage leak over into the rest of the cpu's die if to high and kill the cpu, just FYI. something you might want to read as well, well worth the read IMO.
How memory frequency affects latency - Tighter timings vs. Higher speeds?