I can save you even more money... If iremember rightly mobo companies such as asus etc released a BIOS update so it can cope with a 4790k. I have a spare mobo the ASUS z87 hero board and i have that working with the 4790k
In my humble opinion I wouldn't use AS5 (Arctic Silver) if you wish to get maximum overclocking out of it. AS5 is too liquid and as such the more heat that comes form your CPU (with overclocking) the length of time before you need to replace the paste decreases. The reason for this AS5 as it is...