Really enjoyed a 3 day route earlier this year:
Day 1: Aviemore (Glenmore Lodge)to Braemar via Abernethy Forest, Tomintoul, Loch Builg.
Day 2: Braemar to Blair Atholl via Linn of Dee, Glen Tilt.
Day 3: Blair Atholl to Aviemore (Glenmore Lodge) via Dalnacardoch Lodge, Gaick Lodge, Drumguish, Feshiebridge, Loch Gamhna, Loch Morlich.
Swayndo and myself travelled light by phoning accom ahead and asking about laundry facilities. With all the light layers now it drys really quickly anyway.
You could build on that route with an extra day in Braemar (see Stuartie C for advice on a Lochnagar loop etc) and day 5 round Aviemore with a must do route down Lairig Ghru.
cheers