B&K Pro10 MC if you are going to match B&K stuff; otherwise, I agree with Driver above - the one that sounds best to you.
IMO, sonically, I like the idea of a SS amp with a tube pre combination and the B&K stuff is very tubey sounding for SS gear. I had an ST140 and EX442 for a long time with either a Music Reference RM5 mkII or Dyna PAS 3 tube preamp and it sounded great