I use/used an SVS SB2000 when I had the 2170. Those are on sale now for $699 which is an absolute steal. I know that’s over your budget, but IMHO it’s easily worth double that. Sealed box, with the 2170 setup correctly, it will absolutely disappear in your space.
I’ve gone through many, many components over the past few years (as you know) but the SVS has always kept put.
Highly recommended.