In reply to benallan: amongst all the other comments I thought I would throw an option in, Montane Velo jkt, slimmer body and longer arms for cycling, might fit you if you want a windproof/water resistant thin top, alternatively look at other cycling windproofs maybe?
Bear in mind Boreas is not windproof and doesn't appear to be that water resistant either, but a bit of nikwax helps that bit
Buffalo though if you are prepared to wait a while could make you a longer sleeve option, it will cost extra but you could try for size then say, i want this with a plus 2" sleeve and then in a while you will get it.