I have a brown ale with equal amounts of liberty and perle at 60, 30, and 15 minutes with an overall IBU around 26. It's a brown ale, so the chocolate nutty malt character comes through much more, but I am very pleased with the hop profile. This combination worked out well for me. My original plan was to make an amber with only 2-row, victory, and just a touch of chocolate malt, but decided last minute to add an extra quarter pound of chocolate and turned it into a brown ale. My next batch will probably be an amber with liberty and perle.