Great list. I haven't read Richard K. Morgan. I've read all of the others. I couldn't get into the first Brett novel for some reason. I'll have to revisit it.
I think Brett was hard for me to get into also at first. But once I stuck with it, I sort of liked the simplicity of his style. He's definitely not someone I'd normally read, so his inclusion is sort of like "one of these things it's not like the other."
Morgan is probably better known for his sci-fi work, but his fantasy is very good as well. He reminds me of Abercrombie in some ways, but with a fouler mouth.