Though everyone seems to prefer the VP150 over the VP100, either one will easily blow away your current setup.

Unless you really need to save the extra cash, I'd keep the 150, and know that you'll never be thinking "what if?..."

As far as the rest of the 5.1 setup, Axiom's QS series surrounds are truly amazing. You'll not find a better surround speaker.

That leaves a subwoofer. Look no further than here.

Enjoy you're new setup. You're in for a BIG improvement!