1. Ardgroom Outward
Number one spot, just for the spectacular views.
http://www.themodernantiquarian.com/site/1917/ardgroom_outward.html
2. White Moor/Hound Tor
Possibly the most isolated stone circle in England. Number two spot for its seclusion and inaccessibility.
http://www.themodernantiquarian.com/site/3748/white_moor_stone_circle.html
3. Scorhill
Just because I love it, and because being there makes me happy.