Neal Stephenson's Cryptonomicon, which, I am ashamed to say, I did give up on about 500 pages in, features a very sympathetic, if not polemic, portrayal of Turing, his work and his sexuality. It's all embedded in a very very dense and rather right-wing-ish narrrative about insanely difficult maths and cryptography and WAR and MEN that got the better of me, in the end, but it was where I first learned about him. The Jacobi portrayal sounds fascinating, and perhaps less scary on the maths!