Have you heard Alexander Melnikov?His Shostakovich Preludes are a treasure.He has also recorded on period instruments.Richter was his mentor (though not his teacher).
Wiki says:" Melnikov’s recording of the complete Preludes and Fugues by Shostakovich was awarded the BBC Music Magazine Award, Choc de classica and the Jahrespreis der Deutschen Schallplattenkritik. In 2011, it was also named by the BBC Music Magazine as one of the “50 Greatest Recordings of All Time.” Additionally, Melnikov’s discography features works by Brahms, Rachmaninoff and Scriabin. "
Wiki says:" Melnikov’s recording of the complete Preludes and Fugues by Shostakovich was awarded the BBC Music Magazine Award, Choc de classica and the Jahrespreis der Deutschen Schallplattenkritik. In 2011, it was also named by the BBC Music Magazine as one of the “50 Greatest Recordings of All Time.” Additionally, Melnikov’s discography features works by Brahms, Rachmaninoff and Scriabin. "