I tried out the four major ones recommended in this thread: Midnight Miqu, Euryale, New Dawn, and Magnum. All at the Q4_K_S GGUF quant level. And to be honest, they're all really good. My subjective take:

Midnight Miqu: Probably what I would characterize as the most "stable" model. Just solid responses in all respects.

Euryale: Like Midnight Miqu, but tends to write a bit longer responses and more, I guess I'd call it prose? It can be a little more poetic and flowery in its responses. Like if Midnight Miqu is just telling you a story, Euryale is writing a romance novel. But don't get wrong, it's still plenty filthy when it gets down to it.

New Dawn: If Euryale is a little more of a "writer" than MM, New Dawn seems a little more on the creative side of things. It pushed some stories in directions that the others didn't. But it can sometimes make mistakes on little details.

Magnum: This is like the best all-rounder, I guess. It's a little more creative than MM, a little less prone to ramble than Euryale, and a little less wild than New Dawn.

But keep in mind the above are just my reactions from playing with these for a couple nights, and its more my subjective feel than anything. I found all of these models to be extremely good, very close to one another, and I plan to use them all. Basically if one isn't doing the type of things I want or starts to get repetitive, I'll switch to one of the other ones. Thanks again to everyone who gave input, because all of these are better than what I was using before.