I'm not sure whether to invest in a complete 5.1 package or piece it together myself. I currently have: Front L&R: Technics SB-S407 3-way (150W; 8 ohm) Rear L&R: Boston Acoutics HD5 2-way (50?W; 8 ohm) Are these speakers acceptable to add into a new 5.1 system? I'm not terribly critical about perfect sound, but I'm just not sure if the newer "tiny" speaker packages compare to my current "larger" speakers (not that mine are top of the line by any stretch). Any thoughts? If I go the "piece-it-together" route, what center channel, sub and receiver brand would you recommend? In the end can I save money by adding to what I already have? (a quick look at Best Buy, and I see that a sub alone isn't cheap.