I picked up an old pair of Shahinian Elfs recently and have been very pleased with what they do, both in terms of sound stage, timber and freq.response. Given what has been said and what you have clearly understood about material degredation over time, the older designs are quite viable. I have not sen quantum leaps in speaker design; however some of the materials that have become avaliable in the last few years have allowed designers to realize the full potential of designs.
Happy listening
Happy listening