I believe there are only 2 excellent options. The Kinesis Advantage (360) or the Glove 80. Both are very expensive. Still a bit more expensive, but most simila

I believe there are only 2 excellent options. The Kinesis Advantage (360) or the Glove 80. Both are very expensive. Still a bit more expensive, but most similar with your MS Natural Keyboard, is the Kinesis mWave.