Well the 16gb because I wont be upgrading for sometime. About 5 years. The cooler is fine because it will be changed in the future once I get more money for a liquid cooler that is sufficient but for now air will do fine. I can upgrade to a 850 but I think I will stick with the 750 for now and hope they release better power efficient gpus next year from nvidia that I can put sli so I can still hold on on buying the gpu