For more healthy coffee benefits try these three new custom brews.   Avoid heartburn Try: Gentle Java, which uses Guatemalan arabica beans that are steamed before they’re roasted to neutralize acid and eliminate or reduce more than 70 heartburn- and indigestion-causing irritants. Available in more than 10 varieties, including Wake Up Blend and Irish Crème ($10 to $11; gentlejava.com).   Reduce your cancer risk Try: Caffe Sanora, organic blends with up to 40% more antioxidants than other premium coffees. Flavors include House Blend and Espresso Roast ($10; caffesanora.com).   Get a protein boost Try: JavaSoy Coffee, a healthy blend of roasted soybeans and Colombian and arabica coffee. Each 8-ounce serving provides 7 times the protein (2 g) of a regular cup. It also has half the caffeine of regular coffee. Flavors include Breakfast Blend, French Vanilla, and Caramel Cream ($10; adlerfoods.com).