http://news.softpedia.com/news/AMD-Phenom-II-X2-511-Is-Actually-a-Rebranded-Athlon-II-CPU-181156.shtml
Motherboards:
http://www.newegg.com/Product/Product.aspx?Item=N82E16813128565; micro atx, 4 ram slots, onboard video, usb 3.0, but no sata III support
http://www.newegg.com/Product/Product.aspx?Item=N82E16813131872; full size board, no onboard video
You won't find your cpu on any support list, but any boards that support the 840 phenom II will run your 511.
Power supply: any 450w or higher name brand will run your setup. I recommend antec, corsair, enermax, seasonic, xfx, or ocz, which I use.
Hardrive:
http://www.newegg.com/Product/Product.aspx?Item=N82E16822236339
SSD: http://www.newegg.com/Product/Product.aspx?Item=N82E16820171740; I don't any regular hardrives anymore, only for backup. They're noisy, and take 2-3 times as long to load windows.