I’ve done a good few variations on the main paths up there. I only live an hour from there, so it’s local. A descent of Coire Lair is far preferable to an ascent IMHO. A nice and fairly manageable(in Torridon terms) circuit is park at Achnashellach Station, ride down to Coulags, go up that glen over the 3 bealachs and down into Coire Lair.
The descent to Annat from the Bealach na Lice may top Coire Lair (I can’t decide), but unless you have the energy to climb back over you are faced with a few road miles and a landy track up and over the Coulin Pass, which is pretty dire.
The daddy is what I described first to Bealach na Lice then down to Annat for a pub lunch (2 pints of Bellhaven and a half pound burger with chips), then back up the trail to Bealach na Lice and over the other 2 bealachs into Coire Lair. Just about killed a couple of pals that one. Maybe it was something they ate.
Another classic is the Tollie Path that runs between Slattadale on Loch Maree up towards Dundonnel. This doesn’t do it justice http://www.mountainbikescotland.com/Tolliepathsample.pdf. Wee bit of road then forest and hillside broken doubletrack, pub lunch at the Old Bridge Inn, around the road to the start proper, then a technical doable climb and ace technical descent.