Um, is your friend made of money? If so, this is going to take an arm and a leg. If not, um...
4 subwoofers? Good lord! What size room are you doing this in?
A good bi, di, or quadpolar speaker (such as the QS4 or QS8) from Axiom should take care of most surround needs in conventional sized HT rooms (ie, not an auditorium) If you desire more surround, consider 7.1 with bi/di/quad on the sides and mono/bi/di/quad on the back, despending on your preferences.
Most people in charge of mixing DVDs are well aware that they will be shown in the home; mostly on 5.1 setups with the occasional 6.1s, 7.1s, and really esoteric nuts thrown in there for good measure. They mix DVDs with this in mind; a DVD mix should not and probably is not the same as a theatre/film mix.
