If you could post a short sample of "that bass", someone here might know the free/low-cost VSTi you could use for it, but as Fog and AT suggested, Dimension probably isn't what you want--at least, not without some additional processing.
Computer Music does a lot of dub/house/electro articles and "how to" pieces, so you might be able to find something there.
MusicRadar.com has a "tuition" page that also has a piece on this right now at the bottom of the page. It's for Reason, but you can apply the principles to SONAR. In conjunction with their friends at
SampleRadar.com, they also give away a
lot of free samples (many for dub/dubstep/techno/etc.). In fact, they gave away several nice sets of drum samples all set up for different softsynths. And unless I'm mistaken, some (if not all) of the drum maps were set up by none other than
Fog himself. (That's quite a laborious task, and I for one appreciate the work involved. Thanks again, Fog! And if it wasn't you, well...take the credit anyone. No one will know!)