I have had a SD hot rails in my MIM start since the 90s, always liked it and always had 250k pots. I did try the hot rails split at one point and it was awful, but I really like it with the coils in parallel.
so whatever mini humbucker you end up with, to me its worth adding a switch or push pull pot to be able to switch the coils to from series to parallel. My buddy has a JB Jr and it also sounded very good with the coils in parallel. If you end up with stacked single coils, then this doesn't really apply.