> the cost of off-the-shelf build of similar specs More importantly in my busy life: those same specs work well together and when I have a part failure or two

> the cost of off-the-shelf build of similar specs More importantly in my busy life: those same specs work well together and when I have a part failure or two I have a repair program as good as Apple's. Or if it fails completely I don't have to find similar new parts to rebuild something that my software/hardware setup is already running perfectly on.