I have read that the internal cartridge is a little different on the Bronze, as compared to the Red and Blue, even though the stylus fits. If I were upgrading to the Blue, I'd go with the stylus only. If upgrading to the Bronze, I'd look into a little more before deciding whether to go for the whole cartridge or stylus only.

I am listening to Couldn't Stand The Weather right now, to see if I can get a sense of what you mean. My wife has a Debut III with a Dynavector 10x4 cartridge. Maybe I'll go play it on that setup, too.