1. Balanced Audio Technology (BAT) VK-80 tube preamp - Replaced my Holo Audio May KTE preamp.
2. GIK Diffusers behind my Magnepan speakers.
Both of these purchases brought my sound to a different level.
In April I will be attending the AXPONA show for the 4th year in a row and plan on doing a major speaker upgrade/purchase. Hopefully that will help me make a decision.