My vote is for any bag by Gustto. Depending on your style and what you'd be using it for, the Setela is one of my favorite bags. It's large, but so soft and slouchy. Hangs on your shoulder beautifully and molds itself into your body. It's also amazingly light weight. The Baca is a favorite among many members of TPF. I've heard it referred to as the "bottomless bag" and that's because it can hold so much for a smaller bag (it's size is deceiving). They also make some nice looking shoulder bags.
If you're looking for a soft, slouchy, good leather bag, I think Gustto is your best bet. And with so many sales right now and discount codes (for various websites), you can find one at a very reasonable price (if you haven't already, sign up at Revolve and get their 30% new user discount & use it on a Gustto!)