The driver is a lot more than $450 retail. Tell him $500 and it's his. Still a great deal for him.
And by the way, it actually IS a better driver than the Paradym, but not if you hit the Paradigm in the sweet spot a lot. In other words, if you tend to hit the ball all over the fase and you are looking for more consistency, you should keep it and try to sell the Paradym to your friend. Make sure he's good and drunk before you do it, though.