im a big fan of cervin vega speakers,i heard some quite a few years ago and blew me away with the amount of bass they produce.
haven't seen any for years that people have owned.
I love them. The VE-5m (smaller) pair are really good for monitoring purposes i've found. And yes, my god do they rumble low, i have the crossover set to 60Hz at the moment, so the sub is only handling 30Hz(ish)-60Hz.
As for quality, they're build as well as they sound, solid, crisp and loud.