I was sure you would add FunksX2 to that equation.
Well, I didn't know if he already had subs or not and what kind of budget.
Whatever subs he gets, I recommend getting 2 unpowered subs.
If budget is $4K, then dual Funk 18.0 unpowered.
If budget is $3K, then a different Funk model.
If budget is "only" $2K, then dual RBH SX-1010N subs. Not as much sheer output, but it isn't always about brute force.
The main thing I love about the SX-1010N is that the bass sounds more like my Salon2 (except more), which isn't as powerful as most bigger subs, but subjectively seems lot tighter and "musical" than most bigger subs.