By the end of March the spring run is really kicking off on the main spring rivers.
Personally I would not look past the Dee. Over the last 3-4 years it has provided some of the most consistent spring fishing around, along with some of the most beautiful fly water available anywhere.
In July you really are in the peak of the grilse run. There are countless rivers that will provide first class sport. For me the likes of the Kyle of Sutherland, Helmsdale (club water), Conon and Findhorn will be hard to beat.
Salar33 it may well be worth your while giving Malcolm (aka Willie Gunn) a pm.
As I am aware, he has started his own guiding business.
He should be able to sort you out with some of the very best of fishing in the Grampians and the North.
It is not because thing are difficult that we dare not venture.
It is because we dare not venture they are difficult.