In reply to Mostin3:
The bouldering at the Roaches and other associated crags on that ridge is really high quality and lots to go at in the grades you want. If you do go, make sure you take in the Newstones, Baldstones, The Clouds and the Far Skyline. Big area to go at, and if you fancy a change for a day, head down to the Churnet Valley which isn't too far away. Top holiday.