What kind of music does he listen to, what does he drive? There are many variables that need to be looked at, especially on a $800 budget. Sound deadening, an enclosure, wiring, amp, subs will run more than $800. IMO your buddy should save up to buy the gear to do it right, on that kind of budget he couldn't afford all of the gear you mentioned above. A Sundown 1500d is $525 new alone. That is 3/4 of the budget right there. Save up to get what he wants, and the essentials to do the job correctly. Double post.. OOPS!