Welcome to the CH Precision owner’s club. Congrats on your purchase. Building on your configuration a piece or two at a time is a reasonable approach given the cost of these components. I promise you that after each purchase you will be even more impressed than before. I am not aware of any A1s for sale at this point but if I hear of one I will let you know. By the way, once you get your A1/C1 combo running, if you have any questions about configuration, please feel free to post here or PM me and I will give you the benefit of my experiences as I’m sure others will too. ENJOY!