Ugrading B & W Matrix 803's

The 803's are worth around $1600. My dad recently picked up a set for ~1000, but you should be able to expect more.

As far as new suggestions go, it really depends on the rest of the system. What's your setup?

Golden Ear's Triton Two is a tower with a powered sub in each tower. I've heard them, and they sound pretty good. They weren't as crystal clear as I would have liked, but I heard them immediately after listening to Magnepan 3.7's. They would definitely improve the base on your stereo listening. Vandersteen 3A or 5A's would be a good speaker. I would definitely recommend Maineiac's suggestion.

Personally, if I were putting together a system for classic rock, I'd get some of Zu Audio's Soul Superfly's and run them through a Dynaco ST-70 and a Conrad Johnson PV5 and just keep the 803's for the surround setup.