I personally usually go for $100 comp, and $500 collision deductible. But depending on how much that increases your rate, you probably end up paying more than you would save from an accident in the long run. Comp covers pretty much anything that isn't an accident (rock chip cracking your glass, someone keys your car, etc), Collision covers any crash related accidents. So if you had a rock fly up and crack your windshield, you would have to pay $250 to get it repaired via insurance. Or if you got in an accident, you would have to pay $1000 to get it repaired.