Those two are the only ones I've read too Brian - Wasp Factory and Espedair street. I started the Crow Road and got a way into it, but TBH it was dull. I loved Wasp Factory though; that book was amazing. Loved Espedair too, but it was a little bit more chilled and less disturbing.
We have Inversions here so I'm going to give that a try soon too.
My only crit of Banks is that he tends to start books with reflections and thoughts, but you can't relate to them until you know the character, and this almost turned me off Espedair Street, which would have been a mistake. I glanced at Inversions and he was doing the same there too, but I guess if you plough through it then he'll get to the characters and action and point eventually.