As for hs everyone loves the slk-800 by thermaltake.
Best fan to put on it if you don't mind noise is a 80mm Delta. If you need something more quiet get a smart fan 2 by thermaltake. You can adjust the rpm on it via a knob, you can run out the back of a pci slot or something.
Two sticks of whatever you can afford will give you dual channel ddr performance.