Not all of the multi-part minis will offer you a great deal in the way of reposing, but most will. The latest re-sculpt of the Atlas is a real joy in that regard, with lots of pieces and flexibility in how you pose them.
I recently acquired one of the new re-sculpted Mad Cats and despite it having eight pieces, I found there's really only one pose that works without needing to do some metal work.
Check out the pictures on Camospecs for any given mini and you'll get an idea for the range of poses possible. they're also pretty good about noting if/when a model was modified beyond just posing existing parts.