It depends mostly on your specialty and state. High-risk surgical specialties pay many times what primary care or psychiatry pays, and rates in some states run far above others.
Tail coverage, or an extended reporting endorsement, lets a claims-made policy keep responding to claims filed after the policy ends. You need it when you leave a claims-made policy without prior acts coverage from the next carrier.
Claims-made covers claims filed while your policy is active. Occurrence covers incidents that happened during the policy period, even if the claim comes years later.