For Highend i'd recommend JBL, Bose, Klipsch,
For just bassy speakers: Logitech Z5500, Logitech Z5300
For Plain 5.1: Creative Inspire 7.1 / 5.1 (These produce deeper bass on subs compared to Logitech), Logitech X540
For Cheapo: Generic, Logitech, Creative, All producing
& Lastly Studio...