I can understand the AD route you're taking - and it's clearly paying dividends. I have one multi-brand AD that I frequent, if only to look. There are others. My current pursuits however don't feature at retail, so it's more of a treasure hunt based on tapping collectors and a choice selection of dealers around the world. It's an enjoyable pursuit - slow, occasionally fruitful and always rewarding for the learning and connections that come along with it.