I'd go with 17s for winter tires. Better ride, more (& less expensive) tire choices, and less chances of crashing a rim. I don't think 18s will gain you anything meaningful in terms of grip.
For my winter tires I picked up a used set of 993 Cup II(?) wheels for $250. Winter quality (a little scratched) used 17" Boxster wheels shouldn't be too hard to find in your area for a similar price.
Another alternative you might want to consider is a wheel & tire package from a place like TireRack. When you add mounting and balancing cost to used wheels, the package with "good" quality aftermarket wheels may not be much more.
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