Ibuprofen is not hard on the liver, it is hard on the GI tract. Acetaminophen is the pain killer that is hard on the liver. Aspirin can also cause GI bleeding, as well as increased bleeding elsewhere.
Honestly, I pay about $7 for a big jar (200 pills) of generic ibuprofen, and take 2 as needed. I don't have time to wait around half an hour to see if one will be sufficient.