up your budget another 100 or so and buy a really good outdoor cover from somewhere like big sky or california covers, cut and fit specifically for the car. it will be well worth it
if the car will sit all winter I added a couple grommets to the front so I could put another rope across it to keep the wind from flapping it too much. I bet they can do that now when you order it but if not I had a local canvas guy do it.
before I bought my house I had a car that would live under a cover all winter long and not only did it protect the car it did so for over 10 years, I still have that cover today but now I use it inside the garage