Best pain reliever for a moderate/heavy drinker. ?

im looking for a good pain reliever for someone who drinks on average a 6pack of beer a day. my primary concern is liver damage. and stomach ulsers. the 4 choices are acetemenifen, ibuprofin, aspirin, or naproxin. btw i knowthat the ideal solution is to cut down on the alcohol, but until then which should i use?