i honestly believe that no matter what you're building a PC for unless it's going to be a "set it and forget it" type thing like a server or media center, 16GB is the minimum amount of memory you want to have in a system to completely eliminate any low memory issues for any program you're currently running or may want to run in the future (like CAD or Adobe which are resource hogs) and glitchy programs like browsers that tend to eat up memory for no reason (which they still haven't properly fixed).