I am setting up a home theater system. To start with, I have some JBL L166 Horizons (great-sounding, old, heavy, large 3-ways - from back when they made them right) as my main speakers and will use some newer, smaller circuit city JBL 2-way bookshelf speakers for the rear speakers. Receiver is a Yamaha rx-v650. I would like some recommendations in matching a sub and center to my existing JBL's. I have read a lot in the forums about the importance of trying to match the center channel to the mains. Where I live, I have circuit city, best buy and an independent with high-end stuff. I would like to spend 150-250 on the center and about 200-300 on the sub - on a budget. Any general thoughts on how I should go about the process? Any recommendations? Many thanks.