I had a similar dilemma. A good cover is cheaper, but it traps moisture if there's any humidity. I ended up going with CarCapsule because it's basically a bubble with airflow. Zero rust or corrosion after winter. Regular covers are fine for indoor dust, but if you have any moisture in the air, they don't compare.

Remember that article about how clients never know what they want until they see it? My gut says they'll ask for a ton of changes, because the first draft is just them figuring out their own ideas. It's like they use your work as a rough sketch to finally understand the project. So you do all that work just to give them a starting point for their real requests. Isn't that the worst part of the whole deal?

Time to call a pro for that one.