I really don't get why this is even a questions.  He went cheap the first time which resulted in you working outside of your comfort zone and the result is a less than adequate system, although has gotten him through all this time.  Why on earth would you then discount anything to help someone that as already cheap to the point you don't feel like the right system was installed?  What he wants costs a certain amount of money, charge him that.  If he doesn't want to pay for that, then thank him for his time and move on.