There is absolutely no comparison between the top of the line aftermarket heatsink and an entry level liquid cooling solution. If you were to compare the temps on load when the CPU is overclocked, the Noctua D14 is on par with the H50. I am not bad-mouthing the H50 here but I'd say stick to the D14 since your budget permits it. The D14 has an excellent build quality as well. I am assuming you have just paired 2 sticks of RAM with the board? So they are not working in tri-channel mode either but you could still use the D14 if you push the sticks to the last of the slots.