If I was still using Ortofon then the Bronze would be my favourite; I'm not an admirer of the Black... picks up too much surface noise for my liking. Al is the man for carts as he's had far more expeience than I, I've only owned Ortofon, Nagaoka and AT. When you get in this price range the carts are all detailed but with a slightly different flavour of presentation. Personally I've found the AT's to be wonderfully detailed though a little too bright for my ear, Ortofon are excellent too but a little too forward for me, so I have settled for the slightly mellower presentation of Nagaoka.
You can mount a Bronze on your Silver cart and yield approx. 75% of it's true potential so this cheaper and easier option is open to you. The wonderful thing about carts is the ability to tweak the reproduction to suit your individual taste, however, getting an audition of respective carts is a non-starter which can make mistakes very expensive indeed! If you like the the Ortofon sound signature then give the Bronze a whirl, if you're looking for a change in presentation then be prepared for a journey that will easily empty your bank acount *biggrin* Been there, done that!
So keep asking questions and I'm sure the good people on here will assist with the best possible candidate for you.