Sagaris car cover - which one?!

[snowshot5]

I am looking for some advise as to which Sagaris car cover to buy and where the best place to get it from is. It will be a Christmas present so ideally one that can be shipped within 3 weeks.

The car is kept in a garage, but it is a pretty dusty garage and the wind also gets in at times. So it needs to be a cover that can protect it rather than allow the wind under it to result in the dust scratching it.

Thanks!