I'd back that up. Talk to the folks in the sub forum, but in my opinion, specialization is good in this area - let separate subs do the work down low, let your speakers do the work in the areas where they are better.
Since you're not trying to match tweeters, etc., but are delegating responsibility for the whole 80 Hz and below to the sub, there is no need to have any match of manufacturer, brand or model(s).
So with subs you are free to choose the best available for the price. To me, that is the sub manufacturers already noted.