I must also admit I'm tempted by the Arendal 1723 SUBWOOFER 2S at $2,500 as a one and done solution.
I would say no. Don’t do that. Getting two lesser subs will provide much better overall performance than one more expensive sub. Get two cheaper Arendal, Rhythmik, or SVS subs. And I agree that REL is overpriced relative to the highly competent competition.