You don't need to spend a lot to get the dreaded car audio branded drivers either. Case in point, I paid $300 (slightly used) for my $1,200 Supremo SW6. At full price that's a lot to swallow, but I'll put my SW6 up against absolutely anything you can get from Solen or Madisound for $300.
The Elite home woofer has the motor and similar specs to the car Supremo, with a different cone. The new home branded Supreme woofer looks impressive, but it is only in a 6.5" size. The HU531 is basically the same as the PG Ti Elite. It's limited in excursion, but still a nice driver. I think it's cheaper to get the PG branded ones from Woofersetc vs Madisound.
I can swallow $300.00 a lot easier, and it puts them in the range of the Morel Elite woofers new. That makes sense.
I say this all the time, but I really like Morel tweeters, but feel them come up short with their woofers. I don't know about the Elite woofers, but the distortion numbers on their lesser offerings aren't even remotely competitive.
Honestly though, I'd love to get my hands on some Morel, both home and car for side by side testing. I've always had a love/hate relationship with Morel. I REALLY want to like their stuff. I think it's really just because of the aesthetics. They just look REALLY cool. The kind of speaker you can snuggle up in bed with.
I just question a lot of times whether the price is justified.
To the OP, the reason I suggested the SB driver was because nobody is using it. So, effectively I'm suggesting you take one for the team and guinea pig yourself. If you don't want to do that, then either the CA or ER Seas offerings are great choices.