I recently bought the Asus Transformer Flipbook TP550LA as I wanted the touchscreen capability and it was in a good sale. I'm now shopping around for a compatible stylus for it, with some difficulty. As far as I can read, neither the Asus Taichi or Chi styli will work with my screen. I don't want to just buy a generic stylus if I can help it.. Can anyone offer any advice on this? Much appreciated!