What is the most Reliable high use memory brand?

Well, you have to remember, if you want some of the highest grade memory of highest speeds, you give up your CPU OC.

A lot of companies now a days use some of the same memory, just on their own memory boards.  With that in mind, there are only a few companies rocking memory at the 2400mhz and higher range.  Honestly, you can buy higher memory like 3000mhz, but you start getting into compatibility issues with your motherboard, chipset and cpu.

Take a look around the market at companies such as ADATA, Mushkin, and Corsair.  All companies that have a history of your 2400+mhz memory. Corsair is the most common and widely used memory, but there are at least 1 for ever 3 reviews stating they received at least 1 bad stick of ram.  This can be fan boy's complaining or even just the fact that they out sell anyone else, so their numbers have allotted space for failure return, but they also have amazing customer service for replacing.

I don't have an extremely wide array of experience with 2400+mhz ram, mainly because i'm in to cpu overclocking, but I'd saying any three of those brands will at least put you in the right direction.  Just simple reviews can be done there, though stay away from reviews on newegg on that level of performance as most of those are wanna be professionals who are really just gaming and don't know as much as they pretend.

Go to overclockers, hardforum, etc... and check them out.  But like I said, a lot of those companies are using the same memory, just their own custom boards. So the rate of failure won't be extremely drastic.