But when measuring in room vs anechoic or quasi anechoic, you create a moving goal post.
A decision has to be that you play the F3 game, or F6, or F10 usable bass...
What might satisfy your requirement in one room will leave you wanting if you move them to a different room if considering cabin gain.
I think this is a fun exercise and am happily playing.
I think just short of sitting down and systematically looking through listings, you will be hard pressed to flush that out.
Everything stacks against the less expensive product. You need a larger cabinet, or specialized drivers to get that kind of extension. either, or both, will drive up cost to produce and ship, thus taking them out of the realm of your pricing brackets pretty easily.