They are too very differnt animals. You would be better to compare xls 400 from BK its more the size of the dali. But in short no it won't compare in in sheer output but maybe faster and more tuneful. But i prefer sealed subwoofers over ported.
The monolith is huge and nothing can really prepare you for ths size of it... But i got better preformace out of my paradigm 110 in my room (not depth) i found it more than enough and can be eq sepataly from amp which allows me to hear all the tones the subwoofer is able to do which is very important to me as my pioneer dosnt EQ the subwoofer....
But there is no replacement for displacement in world of subwoofers as they say. But bigger dosnt always mean better!!!! there are othere facters too mostly WAF approval and finish and you truely fit the monolith ( i suggest you make a carboard mock up the size of the monlith and see if fits in the room)
I would look at these which are all comparible and within your price range....(no need for granite in my opinion it tightens the sound up very slighly but it just makes the room look messy! but up to you )
svs sb12 nsd movies and music
SVS SB/PB 1000 movies(pb 1000) and music (sb1000) but would notice the diference myself
Velodyne max eq (been out a while should be able to get a good price) good with movies
but those would be some of alternatives to the dali.... But try to listen to what ever you pick you may find you love dali in which case thats the right one for you.... Happy hunting other my jump in with more but for the money those are hard to beat (sorry for any spelling mistakes im not that great at it)