i find the only downside with coolscan v is that it dont do batch scanning. if you dont mind that, then it is a great scanner.
these scanners have digital ICE, which is useful for dust removing, but it does not work with B&W film.
i believe Vuescan & Silverfast are among the best scanning softwares.
PS: if you have are going to scan a lot of Kodachromes, maybe you should read this topic