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Given that RAM is so cheap, I don't see a need to skimp on it. I've chosen 4GB (2x 2GB) of G-SKILL DDR3 1333.
I've gone for the cheap-and-cheerful — but thoroughly reliable — LG Black UH12NS29 Blu-ray combo drive. As well as being an excellent all-round performer, this drive is both silent and jam-free.
Chassis + PSU
Since this is a budget build, there's no need to go spending big money on a chassis. And for the first time, I'm recommending a cheap chassis and power supply unit (PSU) combo from Rosewill.
The R103A is a mid-tower chassis that comes with a 350W power supply fitted as standard. The PSU is not the best in the world, but from both my personal experience of these, as well as hearing from other owners, they're fine for low-powered systems.