hey everyone. i just realized today that my car has been keyed. pretty bad too. full length on both sides

. anyway, im convinced that its something personal and i have a pretty good idea of who did it. what ive been thinking is maybe i could set up a camera in case he comes back. ive been looking around at wireless cameras and recording devices. i was hoping someone could give me some advise on what to buy.
here's the situation. the car is about 50 ft from the window i would set this up in. i would like for it to be able to make license plates legible. what kind of resolution would i need for that? keep in mind i am not rich so i would like to keep this low budget without sacrificing quality. also i want to be able to record for 2-3 days but at the very least 24hrs. i want to know if i can record directly onto my harddrive or would i need a separate recorder?
you guys always come through for me so thanks in advance