Personally, I think Sony speakers are crap. I would never buy that stuff. They make many great products, but I've never heard a Sony speaker that sounds good.
How much do they want for that at Best Buy? If you're gonna buy that stuff get it here.... I'll bet they're way cheaper.
http://www.onlinecarstereo.com/CarAu...roductID=13718
http://www.onlinecarstereo.com/CarAu...roductID=12953
What's your price range? Maybe I can give you a little better option.. I know one option that would be great, and that would be to never ever buy car audio equipment from places like Best Buy, Circuit City, and stores like that. Head to a couple of car audio stores in your area. Their prices will be better and the people in the stores will actually know what they're talking about.
Also, is it a sealed or ported box, and what are the dimensions of the box?