In reply to ColinVern:
The Keela Munro might fit the bill, as long as you don't mind something a bit heavier and warmer than most modern shells. Very well made, hard wearing, effective, comfortable and cheap by the standards of Gore/eVent?Paramo etc. Or look out for one of the Rab eVent jackets, like the Mountain Dru, which are often on sale and so fall into your price range.