Get the 'Usugumo' it is really hard to graft and as a result very rarely available. Can't do better than getting one of these from Matt and Tim, and the other stuff will be available later. It may be that mine struggle a bit because of the really low pH, though 'Hoshi yadori' does fine right next to one of the 'Usugumo'. I really want to get 'Hot Blonde' into the garden, it looks like a real winner. Another yellow to consider is the excellent A. buergerianum 'Michael Steinhardt'. I got one of these from Matt a couple of years ago, it's very pretty although doesn't have it's feet well under it.