For value systems I'm building for others, I use Kingston ValueRAM usually, combination of great price and lifetime warranty for systems that won't be overclocked. I don't recall every having one of their SDR or DDR modules fail on me.
For my own system, I've usually used Crucial, but I had two ECC DDR DIMM modules fail on my last setup within 8 months of each other. Even though they were replaced under warranty, I decided to try another vendor and got Corsair XMS when I got a new board that didn't use ECC memory. I've been very happy with the two PC2700 modules I got, and have had perfect stability with them. Unlike Crucial, you get some nice heat spreaders with them too.
As for heatsink/fans, I'm using a Thermalright SLK-800. Massive, but with a solid clamp and supports an 80mm fan.
Intel Q9450 @3.2GHz, Gigabyte GA EP45-UD3P, 4 x 2GB G.Skill @4-4-4-12
Antec P160SW case (modded), Xigmatek 750w PSU
3x 500GB (RAID-5), , OptiArc 7200S, ASUS E818A3T
Creative X-Fi XtremeGamer, Hauppauge HVR-1800, Radeon 4890