Given your budget, I would sure look at a good pair of front speakers such as Vandersteen 3A Sigs. The Vandersteens are much better than the Paradigms (IMHO) and are easier to drive. Since you primarily listen to two channel, I would recommend a good sub that would mate to the Vandersteens (Vandersteen sub) for both two channel and home theater use, with the surrounds being the cheapest component. You should be able to get all of this for $5,500 used, and have a system that will last you a long time regardless of your future component upgrades.
Good luck
Good luck