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For this build I'm going to go for registered memory for this build and throw 24GB into the system in the form of 6 x 4GB modules from Crucial (part number CT3KIT51272BA1067). These come in 3 x 4GB kits so you will need two of them.
Unsure about how much RAM you need? Check out "How much RAM do I need?"
Price: 2 x $105.
For this build I'm going with a power supply that I've used many times and that I trust to deliver solid, reliable performance -- the CORSAIR Enthusiast Series TX750 V2 750W. This offers 750W of power, and a wide range of connectors. On top of that, it's quiet and is 80 PLUS efficient so it won't cost too much to run.
CORSAIR Enthusiast Series TX750 V2 750W.