Cryoburn is pretty good, although like too many Vorkosigan novels it relies heavily on coincidence, which kind of bugs me. I didn't like it as well as DI overall, though it has its moments. It has two children as significant characters, and one of the nice things is that they are believably children, with childlike interests and without the precocious brilliance of too many kids in fiction. Both books are primarily investigation-mystery sf, with some action thrown in. I do like the way Miles now generally has the authority to do the stuff that he does and isn't constantly doing an end run around his own command. I'll give Diplomatic Immunity an 8 and Cryoburn a 7.
I only have Captain Vorpatril's Alliance left to read after this. I may look for a romance of some kind next after that. And of course the eight more Aubrey/Maturin books.