Yer nae tae far from Golspie laddie, mebe an hours drive from Drum, would be well worth a visit. Otherwise head to Contin just outside Strathpeffer (20miles? away) for some xc, Learnie on the black isle (40miles?) for a short but technical trail. There are also loadsa secret trails about, including mine (10miles away) but im no telling where it is.
Abriachan is a basic route made out of the wrong type of gravel/marbles, only gets interesting when you head into the red natural trails where you will find some nice singletrack mixed with peat and the slipperiest north shore in scotland, its been coated with eels. There is a route which takes you over the top of the hill which gets interestiing on the descent, lots of steep steps. You can also link this up with the west highland way which will take you to drum without to much tarmac pedalling.