Given the components you have I agree with Jmcgrogan2. Particularly the CJ preamplifier. A CJ, and a good SS power amp like a Brystom 3bst sound fantastic with the Vandy speakers. This would take you system to a new level, thought the Nad amp is no slouch either. The recommendations about the the others like the Audible and Modright will not provide the same level of warmth you seek and the match for what you have.