Buyer incentives

Just wondering, what's the best incentive to provide a Buyer in a real estate transaction?

Options:

• Cut sales price
  
• Closing credit to Buyer
  
• Seller providing points to Buyer

I'm not advocating one of them I always stuggle with which is most effective. I think providing point(s) to a Buyer clearly gives the best value to the Buyer. I've always viewed the cut in sales price versus a closing credit as a wash and often just a question of what a lender is comfortable with showing on the HUD-1. Of course if the credits get too big I certainly worry about a RESPA violation.