i would settle for a barebones machine with the basic CPU, onboard graphics, and like 4-8gb of ram but the ability to add in whatever cpu(s) and GPU i wanted, u

i would settle for a barebones machine with the basic CPU, onboard graphics, and like 4-8gb of ram but the ability to add in whatever cpu(s) and GPU i wanted, under $2000. Preferably around the price of the base imac.