i would look into the American Bass XFL series subs or the SSA Dcon, Gcon, or Icon. All very well built drivers. All of the SSA stuff is built in the US of A WITH US parts. I am friends with the owner on Facebook. Great guy and although he knows he can make more money if he outsourced overseas he prefers to keep his reputation and make less money.
If you are Okay with buying used there are a couple groups on Facebook that will be quite helpful.
https://www.facebook.com/groups/caraudioQA/ -- Massive amounts of good info here from people that will honestly help you determine which direction to go.
https://www.facebook.com/groups/388436331210782/ -- tons of people selling really good new and used equipment
https://www.facebook.com/groups/246585605413072/ -- same as above
I also have several groups on Facebook for buying and selling various bits of equipment but as of now there aren't nearly as many members in my groups.
Here is my group strictly for the sale/purchase/trade of Subwoofers.
https://www.facebook.com/groups/subclass/
