Amazonia

First of all, I could not decide on which forum to post these questions. If this is not the most appropriate forum, please let me know where it should go (and moderators may move it).

Saddle-selection information says that the further back you sit, the wider the saddle, and conversely, the super narrow saddles are for speedsters whose butts barely graze the saddle. Other than the additional weight, is there harm in riding a wider saddle even if you spend considerable time in a forward position?

As far as leather saddles go, I have had a couple of Brooks, and am wondering how their break-in time compares to a Rivet saddle. I know the type and treatment of the leather impacts the break-in period as well. The saddles under consideration are Brooks' (antique brown and brown), B72 (only available in brown), and Rivet's Imogene and Loveland (both of which I would get in brown).

I would also appreciate experiences with Rivet saddles, especially from those who also have had Brooks'. Thank you!