I can recommend the Maine, Persier and Oregan (sp?) as good dives to do from Hope Cove. All 3 sites are suitable for reasonably expereinced sports divers, the Maine and Persier are ideal nitrox depths as well. I think Oregan was a touch deeper (38ish, it was about 3 years ago since I dived it.)
Best bet for information would be the wreck tours from Diver magazine website. You'll be able to find GPS and transits from the articles. Maine is dead easy to find (even I've managed it!). Oregan was much harder to find, not much sticks up.