Messed around using the same models (plus a Razorback I had spare) and knocked it down to 1500...
Quicksilver, Might of Titan, Warp Rift, Sanctuary, Shrouding
10 man Strike Squad
2x Halberds (Justicar and buddy)
Totals at 1470. I'm a bit frustrated at the loss of Thawn, but the only option I can see to get him back in whilst keeping close to what I have here is swapping the Libby for Crowe and dropping the Heavy Incinerator, which I'm not keen on doing.
I understand what you said about the Terminators, however I want to keep them in this format so I have the extra Justicar available to accept a challenge on my Librarian's behalf to keep him safe. The extra 30pts has me pondering, as I could take a relatively fighty Grandmaster with some nice gear, but I lose the versatility and Mastery bonus of the Librarian, and I feel as though the list is punchy enough, given the Dreadknight.