I have the BP8s as rear surrounds, but just last night replaced my front BP8s with BP10s. I can definitely say the BP10 have better bass response due to the larger woofers, but aside from that they don't sound much different, they are just larger. In fact, I'm selling a pair of BP8s if you are interested. Since you already have a great sub, I would steer clear of the towers with built in powered subs, as that may make it very difficult to set up, you don't want to cancel out any bass waves by having too many subs.