Sumatra coffees are also good candidates for aging, if you can find a good aged Mandheling that's an even more intense and complex flavour. I bought a bag of quality aged Mandheling a year or two ago and it was the most intense flavour I've tried, earthy like drinking the damp forest floor of a jungle (but in a good way!), very strong pipe tobacco and pepper notes and an aftertaste that felt like it kept developing for like a minute after a sip.