Get a used REL Strata II. Yes, you need a sub for home theater. A self powered sub doesn't strain your amp.
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Swampwalker is right ... and I'll add that if you have crushing bass in your mains, leave the sub out of the music equation unless you have some perverse need for all that bass. I have always maintained that a sub is the hardest addition you can make to a stereo system. The crossover points and placement can drive you to distraction.