seeing as there are a lot of deals going on nowadays i'm after one as my 20 watt version that came with the kit has started to fart

so, what is out there that properly thumps?

the little titchy speaker set up i got for the pc (which loads of peole said would be crap due to it being about £20) properly shakes the house (i was in bed and it woke me up this morning) AND it's clear as anything so i'm not after a "name" i'm after something that will thump

seeing as the 20 watt sub did the business adequatly for so long, how big is big and how much space to they take up? seeing as they all seem to be in boxes about 15" square?