I doubt that EPP code above is any good. EPP had their own code going at 33% plus the 6% or 12% normal. They would not run a $750 off along side their own promotion at the same time. I've never seen it work like that. Ever.
Still, the 45% off with a longer warranty makes for a good purchase from EPP. But they were still no match for the Home user $750 coupon today. That's assuming you got a $1500 machine and took $750 off. The more you add to the config, the more sense it makes to pass on the $750 off home user and go with the EPP program purchase at 45% for those eligible.