NOt to much help here, but I had one of those "tent" garages as posted and it was kind of sucky. Here in the NE in the winter water will seep in under it and if it freeze then it is a skating rink. Gets very hot in the summer too.
Car port would be good, I'd add vinyl lattice to it to help cut down on lookie lous, wind and water and debris from blowing around inside.
I take it you are on a tight budget so looking into those prefab garages for $3200 and having a "contractor" come out and build something is out of the question.