So far, I'd say you have great taste in reptiles, but it's hard to know what really appeals to you- there's so many options, & a wide range of sizes too. If you like larger & more active snakes, you might enjoy something like a Taiwan Beauty rat snake. I've raised & kept those in the past, & I had no trouble with them biting but they're not boring, either- more like a racer than a rat snake. Not snakes that want to sit still much, that's for sure.
I've had many kinds of snakes over the years, & it's impossible to pick a favorite, because they're all good at different things. For mellow & curious snakes, I love Trans Pecos & Bairds rat snakes, but I'm guessing from what you have so far, they might not be challenging enough? I enjoy bull & gopher snakes too, & most rat snakes.
While I never planned to have such a large (heavy) snake, I also loved having a Mexican boa (BCI)- she was a feisty rescue that had a number of previous owners for her first year, until she finally landed with me, & she never even once bit me, but I understood her better & helped her to finally feel safe. Let us know what you decide on-![]()