In reply to smuffy:
Another vote for bothies.
But this far in advance I wouldn't decide upon an area. You won't know until the time what areas have good climbing, or indeed if there is any snow at all and perhaps mountain biking would be a better bet.
I think it is better to search out some good venues for various options:
if there is climbing west and not east
if there is climbing east and not west
if there is good climbing on the islands (rare, especially for Arran or Rum, so worth snapping at if it happens)
if there is good climbing everywhere
if there is no climbing anywhere