The bass cannon is not far from the recommendation I will make...and that is to DIY some horn loaded subs. There is little to recommend from the commercial offerings in your price range.
The general rule of thumb is for the subs to be 2x the physical size of the tops (and that is for Top 40...for EDM the recommendation is 4x the size).
Checkout the Titan 39 on this DIY site. If you are DIY capable, you will not be disappointed by any of the designs here.
http://billfitzmaurice.info/
For reference, I have built ten DR200's and ten Titan 39's. The system is sized for a 25,000 sqft ballroom. I have also built one Titan 48 for a friend.
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