I've heard very mixed reviews about the motions. Very average apparently.
Agree re the P Road 2 or even Contis own Road Attack 2.
I'd flag the 170 idea. It will fit OK but I'd be more inclined to raise the fork tubes in the clamps so 5mm is sticking above the top tree (not flat like the stock set up) - I think you'll be happy with this and still have a full 180 to play with.