I'm trying to reduce the amount of "junk" (the Missus's term!) , You can't go offering me more rackmount gear! Much as I would like to fill one of the "cubbyholes" here with a nice 48U rack stuffed full of 48 core beasts and Cisco switches, the other half has insisted that's not going to happen.
4x1GB of Registered ECC PC3200 is fairly cheap now, about a fiver a stick from fleabay if you fancy filling it up, (Though I can't see this Forum using 4GB, I suspect the processors would struggle before the RAM).