Buy a used C8 as someone suggested. If you want new I would recommend getting 2LT and foregoing the Z51 if the price is an issue. Unless you are planning on tracking, which, from your comparison to a fully loaded C7 as your other choice, I assume you’re not. The 2 LT gives you a lot more for daily living versus the Z51. And since you’re not a Corvette person, you won’t miss what you don’t have (to quote Murray).You're comparing apples to oranges.
The C8 is mid engine and the C7 is front engine.
You don't mention whether the C7 is a stick or not, but that's another consideration.
The 1LT C8 is bare bones while the Grandsport is loaded with options.
I never wanted a C7 and really wanted a mid engine car.