In reply to jamesofdeath: I've camped a few times in Gleann an t-Slugain just after where the path splits at NO 129 950. If you take the left hand branch of the path you come into a superb area for camping which I've always known as the Fairy Glen.
There's also lots of areas to camp higher up by the Glas Allt Mor.
I would second the use of a mountain bike. Easy cycling to the Fairy Glen.
It all depends how far you want to go with a heavy sack. Fairy Glen would be my preference.