Bat100 has some more top picks here:
Castlerigg
http://www.megalithic.co.uk/article.php?sid=327&sv=1
Drove Cottage Henge
http://www.megalithic.co.uk/article.php?sid=4958&sv=1
and not forgetting
Robin Hood's Stone
http://www.megalithic.co.uk/article.php?sid=8435&sv=1
Something is not right. This message is just to keep things from messing up down the road