I am currently running a D975XBX2 and I am looking to upgrade to 4GB of memory. My top priorities are stability, reliability, and manufacturer support, but I'm not looking to dig to the bottom of the barrel for performance. I am currently using 2GBs of Mushkin XP2 DDR2-800 at 4-4-3-10 @ 2.0V and they have been fantastic. I would like the 4GBs of memory that I buy to last a long time since this is the last set of memory I wil be buying for this system. I have been looking at buying another set of Mushkins, but I am open to other brands. What would you guys recommend?