From what I've read of the radio threads in this forum, there are a lot of people who are unimpressed with the stock radio. You may have to spend the bucks to get the sound you want.
I have a CDR-220 and to my admittedly middle-aged ears, it sounds pretty good when the top is up or I'm not moving. But mostly I drive with the top down and my conclusion is that over about 30 mph (top down) it won't matter how much stereo you've got - it sounds mostly like wind.
On the bright side, with this car, the wind and the exhaust are music to my ears!
