Sorry but you asked for opinion, as there is no definitive answer here are my opinions.
You say you did not want a full cover. Why the hell not? The idea is to protect the car, it's not a fashion statement.
Some facts now, rather than just opinions.
I bought a full cover for less than you paid...... God bless e bay.
My full cover is for overnight use only whilst the car is on the drive.
As I do not have a garage available either I rent a garage that is a mile or so from home just so my car can be stored overwinter.
Back to my opinions.
Acid rain, tree sap, bird sh*t and grit (flying up from your drive) are probably the most destructive elements to your car's condition.
I repeat. Why not cover it all up. It is worth thousands. Wrap it in blankets, cover that with plastic sheet and then throw a breathable, waterproof cover over the whole. You will need to add some additional straps (I use bungee cords) as the wind can get under and tear the lot off. I chased mine over the park we overlook before learning that lesson.