You should size up with Castelli gear so a medium will fit fine.
I've got 2, short and long sleeve. Can't really praise them enough.
Have you seen the Cervo Rosso Ibrido?http://cervorosso.com/index.php?section ... oductId=64
It's available in red or black and if you use dicount code AP201312 at the check out you'll get 15% discount which brings the price down to just over £121.00.
I bought one last year as I kind of liked the idea of a half jersey/half jacket despite being not totally convinced of when I'd actually use it. I ended up using it on almost every ride in spring and it rapidly became one of my favourite pieces of kit.
So we hate the Nufenen, the Tremola Gotthard road and the Susten. So, same time next year then:)
I'd definitely be up for a ride sometime. Have you done much riding in the Jura?