First, on discounts, besides the 10% off on individual items ordered from the Outlet, you can get an additional 5% off if you order at least five items(at least $30 each)at once. One of them could be as little as $30 worth of speaker wire.
As to the proposed system, you're going way over your original budget, but I'm going to try and hold you to it. As I suggested before, get the M22s and QS4s, then add $30 of speaker wire for the fifth item to get the 5% discount. A more powerful sub than the EP125 is desirable, so I'll again mention that Acoustech PL-200 for which offers around $280 have been accepted. Also, I'll repeat that you can at least temporarily do without a separate center speaker, since the M22s create a fine phantom center image.
