Build a WO 10 and put these in it: Decware MODEL DHMPRO
Go here:
http://www.decware.com/newsite/mainmenu.htm, click Speakers, and scroll down.
Your friend knows not of what he speaks. The WO will blow him away. If he likes it, build him two.
Read the details on SPL with that driver. I've been looking for years for better drivers than Steve's to put in a WO. Now Steve offers that "better" driver. I'd say buy it.