There is no such thing as overkill. You can turn any amount of subs down to the levels you desire.
EDIT: For $1,500 starting with dual Monolith 10", dual monolith 12", Dual SVS PB-1000 pro or dual HSU VTF2 would be good starting points. Starting with SVS (free returns) might be the best options so you can get an idea of how much bass you want.
EDIT: For $1,500 starting with dual Monolith 10", dual monolith 12", Dual SVS PB-1000 pro or dual HSU VTF2 would be good starting points. Starting with SVS (free returns) might be the best options so you can get an idea of how much bass you want.