At what price point does a prebuilt become the better option? Family member is looking into possibly getting a new one and he doesn't use it for anything demanding, just typical internet usage, email, programs like excel. If I built one, there are 2 requirements, good airflow and has to be less than 15 inches tall, 15 inches is the absolute max and no type of clear side panel. After looking at cases, it turned out harder than I thought to find a case that I thought would be good.