Hi Backpacker, just done Bennachie, pick a good day and do the whole circuit, fine walking on good paths once your on the summit, makes for a fine day out, remember to include the wee 2000er to the South, see my report
Cannot advise on any other Aberdeenshire hills as I have not done many, so might meet up with you some time on thehils
As for Angus hills just ask, know them pretty well as they are local to me. I would join you on Keen, but Im down South just now!