Upgrading to a big CC speaker that is capable of decent bass response sucha as the VP160 or 180 is one of the best upgrades that one can do for a HT.
I just went through the same exercise with acquiring a VP160 to replace my VP100 that resided near the floor on a shelf that didn't have enough height. I ended up buying a new stand to accommodate this beast; however, it was on clearance at a tremendous saving so it all worked out well.
Here's how it turned out:
http://www.axiomaudio.com/boards/ubbthreads.php/topics/399235/5TAM
