For ptarmigan (& dotterel) try Carn Ban Mor- minor road off the B970 at Feshiebridge, then a steady walk up from Achlean. Bit of a hike, but may be quieter than the top of Cairngorm. Forest Lodge used to be reckoned a good spot for Scottish Crossbill
slavonian grebes - loch ruthven, ospreys fishing at close quarters - inverdruie fish farm, spotted crake - insh marshes, nesting peregrines - aviemore, assorted raptors - findhorn valley. be sure to post your sightings, phil; im going to the same area myself on tuesday!