Viewing some used cars tomorrow: any tips?

So some idiot crashed into my car on Monday night (whilst it was parked). The best part? It's happened twice in two years. Fun right?

Anyway. I'm viewing some cars tomorrow. I've got a budget. 4k at an absolute maximum (primarily because I'm convinced it's going to get wrecked again).

I'm going on my own and I know next to nothing about cars so I'd really appreciate any tips or clues as to what to look out for.

Update

Looking at some more cars tomorrow with my step Dad. Fingers crossed. Your advice has been very helpful. Cheers.