The other thing you can do is plug the port with foam (or an old sock). That would increase your possible choices. Personally, I don't care for sealed box speakers but maybe I've never really given them a chance. Here's are a couple of examples of a pretty good dual-driver bookshelf speakers. http://www.axiomaudio.com/m22-bookshelf-speakers#t-2 http://www.ascendacoustics.com/pages/products/speakers/cmt340m/cmt340m.html Polk LSi9's would be another great choice. Polk sells refurbished examples on their Ebay store for $450-$500 a pair. But the matching center doesn't seem to be available anymore and they can be hard to find on the used market. But one of the better center channels I've heard. I guess you to need to find the center that will fit your space first, then choose the fronts from the same brand/series. What is the surround speaker placement situation? With a $2500 budget expect to spend $500-$750 on the subwoofer.