My rule of thumb when purchasing a computer: think about what will be most (relatively) useful 18 months from now. I always consider purchasing a new computer

My rule of thumb when purchasing a computer: think about what will be most (relatively) useful 18 months from now. I always consider purchasing a new computer every 24-30 months. The 6-12 months is my "coping" period between the old computer and new computer depending upon my needs.