For in-wall, I would get five Revel W253L in-wall for $200 each (MSRP $300), Total $1,000.
New Revel W253L in Wall Speaker with Grill Each | eBay
http://www.revelspeakers.com/Products/Details/212#specs
Then get Dual HSU VTF-15H subs for $1995 delivered.
http://www.hsuresearch.com/products/vtf-15Dual.html
Or other subs.
Subwoofer Performance CEA Standard (THD <10%) 2 Meters SPL @
20/32/40/50/63 Hz:
$500 Cadence CSX15MK II: 83.8/93.3/98.6/109.3/115.5
$1200 B&W ASW-610XP: 85.1/96.1/101.5/105.9/108.9
$500 EMP ES1010i: 85.0/97.0/102.5/106.0/105.0
$700 Emotiva X-Ref 12: 81.0/99.1/103.5/107.6/108.5
$1600 Klipsch SW-311: 84.2/102.6/105.3/108.6/111.4
$769 SVS PB12-NSD: 103.2/105.9/106.5/107.3/108.0
$4000 Velodyne DD15+: 97.0/102.0/109.0/109.0/112.0
$900 Aperion Bravus II 12D: 87.0/105.3/109.8/112.6/112.2
$879 Velodyne EQ-MAX15: 84.8/104.2/110.0/114.2/114.8
$1,200 RBH SX-12: 87.7/108.0/111.1/113.7/112.7
$650 Outlaw LFM-1EX: 101.0/110.7/112.3/113.7/113.8
$800 Power Sound XV15: 102.7/109.6/113.7/116.6/114.7
$800 Epik Empire: 102.2/109.7/113.2/116.4/119.2
$2200 JL Audio F112: 92.8/112.4/116.2/113.3/117.6
$1700 Funk FW12X: 107.0/112.4/114.0/113.9/113.1
$1200 SVS PB12+: 107.0/111.5/114.3/115.3/115.3
$9,000 Paradigm Sig Sub2: 106.4/109.9/113.2/116.9/120.2
$900 Hsu VTF-15H: 103.9/113.0/115.7/115.7/115.6
$5,000 Velodyne DD18+: 103.4/113.0/115.8/116.8/115.3
$2,000 SVS PB13 Ultra: 110.6/113.5/115.5/117.5/117.8
$700 Chase HT VS18.1: 111.1/ 116.0/118.1/117.8/117.2
$1,200 Rythmik FV15HP: 108.1/117.0/119.5/119.1/118.8