This is what I bought back in May:
Intel Core i5-3570K 3.40GHz (Ivybridge) Socket LGA1155 Processor (77W) - Retail
OcUK GeForce GTX 570 1280MB GDDR5 PCI-Express Graphics Card - OEM
MSI Z77A-G43 Intel Z77 (Socket 1155) DDR3 Motherboard
Crucial Ballistix Sport 8GB (2x4GB) DDR3 PC3-12800C9 1600MHz Dual Channel Kit
OCZ ZS Series 550W '80 Plus Bronze' Power Supply
Zalman Z9 Plus Tower Case
I also had to get the OS, HDD, mouse/keyboard and monitor as it was my first build.
I also built a similar one for my brother recently, but it had a gigabyte mobo and 6850 gpu.