Hi,
though I haven´t been there I´d suggest the coastal region of Lochinver on the western coast, the Summer Isles in the water (where isles tend to be), the Western Isles on the for horizon and some of the somewhat nicest mountains in the back (Suilven, Cul Mor). When reading travel guides and others comments this seems to be a very promising place and I´ll go there next year.
Greets from the Winnerland
Alex

...lot´s of sinfull komments...

gosh! now I´m reading your leaving on August, I guess I´m a little late