Bob,
Nice system! Do you have a sub now?
SVS just came out with new drivers, so take a look at the PB10 and PB12 NSD entry level units, or any of the Plus series. That's a decent size room, so don't skimp on the sub. The /2 series are as big as end tables - and there's practically nothing that sounds as good for the price. If you can swing the size and budget, take a good hard look at the larger boxes.