For an intermediate windsurfer like yourself aiming to refine skills in various conditions, consider a board https://easy-surfshop.com/do/cat/windsurf/WINDSURF that offers a balance between stability and maneuverability. Typically, a board in the 120-150-liter range would be suitable. This size provides enough volume for stability while allowing you to progress in more challenging conditions as you advance. Choosing the right sail type depends largely on the wind conditions you frequently encounter. As an intermediate rider, you might want to consider a versatile sail range (e.g., 5.5m to 7.5m) that covers a broad spectrum of wind strengths. Brands like NeilPryde, Severne, and Duotone offer reliable sails known for their performance and durability.