I would not lower it. I would still change the shocks as your stock ones are shot, but I would leave the ride height alone as well as the general stifness on the car. A stiffer car is not want you want in the snow. I have snow tires on stock cups and they work fine, but you might want to take advantage of the fact that 993's came with 16 inch stock rims which will give you flexibility in the tire selection. Heated seats will also be very very nice, when I drove mine in the winter they were fantastic.
similar thoughts have crossed my mind many times, if I had my way I too would be driving a C4 in the winter.
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