Consider this Combo , and I think the Asus board comes with 3 years warranty, which is a big plus (rather than 1 year with the chosen Gigabyte). The memory is tiny bit slower. http://www.newegg.com/Product/ComboDealDetails.aspx?ItemList=Combo.308218
Overclocking the CPU will give you a big performance boost; I’m not sure how good the supplied fan is for moderate overclocking, others can give you better answers. Overclocking the GPU should give 10%+ performance increase.
Well you can do without an optical drive,you can use usb flash drive or harddrive for OS installations.