if we are talking straight up balls to the wall 5kw or more for a sub here is a good list, in no particular order
Treo CSX
MMATS Juggy
Kove Armageddon
DD 9500,9900 series can't believe people left that out
RE MT
Adire Brahma Xtreme
Kicker Solo X
RF Team RF
Cerwin Vega Stroker
Orion H2 or HCCA
Shocker Sig, Xtreme II etc etc
MTX RFL personally don't like it but it's decently loud
Ground Zero Nuke
Eclipse TI Pro
all of those get stupid and i mean stupid loud but none are for the amateur audio nut. hell 4-5 of those woofer's i wouldn't even touch b/c i have not the power or knowledge.
adam