For your MB, I like the Gigabyte Z68X-UD4-B3. It has all the benefits of a z68 board, plus a great port complement and arrangement of ports.
For the CPU cooler, I like the Thermaltake Silent 1156 (also works with 1155). Great quiet cooler that is very effective.
For the memory, look at G. Skill Ripjaws. Very reasonable priced and quality memory.
For the case, take a look at the Cooler Master Storm Enforcer. I have it, and love how easy it is to work in, plus it's a great looking case.