also OS? you didn't mention if you need it or not.
cost saving wise, you can go with a h67 board like intel BOXDH67BLB3. It will save you about $25. The difference between h67 and z68 are:
no overclocking, 2400 can't overclock anyway
no quick response, that a SSD related technology and the main difference,
and its an micro atx board which means less pci-e slot, you don't need that many unless you got lot of addon card. http://www.newegg.com/Product/Product.aspx?Item=N82E168...