+1
Assuming $500 is the absolute max including shipping, I would unequivocally take the HSU VTF-1 MK2 for $477 delivered.
CEA Standard 2 Meters SPL @
32/40/50/63 Hz:
$1200 B&W ASW-610XP: 96.1/101.5/105.9/108.9
$700 Emotiva X-Ref 12: 99.1/103.5/107.6/108.5
$1600 Klipsch SW-311: 102.6/105.3/108.6/111.4
$769 SVS PB12-NSD: 105.9/106.5/107.3/108.0
$300 BIC PL-200: 102.5/107.7/110.4/108.1 (HSU STF-2 clone)
$4000 Velodyne DD15+: 102.0/109.0/109.0/112.0
$900 Aperion Bravus II 12D: 105.3/109.8/112.6/112.2
$879 Velodyne EQ-MAX15: 104.2/110.0/114.2/114.8
$1,200 RBH SX-12: 108/111.1/113.7/112.7
$650 Outlaw LFM-1EX: 110.7/112.3/113.7/113.8
$800 Power Sound XV15: 109.6/113.7/116.6/114.7
$1200 SVS PB12+: 111.5/114.3/115.3/115.3
$800 Epik Empire: 109.7/113.2/116.4/119.2
$1700 Funk FW12X: 112.4/114.0/113.9/113.1
$9,000 Paradigm Sig Sub2: 109.9/113.2/116.9/120.2
$2200 JL Audio F112: 112.4/116.2/113.3/117.6
$900 Hsu VTF-15H: 113.0/115.7/115.7/115.6
$5,000 Velodyne DD18+: 113.0/115.8/116.8/115.3
$2,000 SVS PB13 Ultra: 115.5/117.5/117.8/116.6
$1,100 Chase HT VS18.1: 116.0/118.1/117.8/117.2
$1,200 Rythmik FV15HP: 117.0/119.5/119.1/118.8