My favourite Mr. Darcy is David Rintoul from the 1980 version of P&P, which gave me my first impressions of the story. The production quality was pretty poor (it was 1980) but the actors were excellent and the characters and story very true to the book. When I read P&P fan fiction, i tend to see this Mr. Darcy in my mind (hope i get this picture posting thing right. if not, please google "David Rintoul" and look for the man who looks really good with a top hat and cravat).
I've never seen this adaptation, LP. But I've heard it's very true to the book. Hope to get a chance one day.
Look What I have found! Peter Cushing, master of horror films, as Mr Darcy! http://madaboutdarcy.blogspot.com/
Not my favourite...but very interesting!