Hi, I'm trying to figure out the differences betweent the various Bamix models. I've seen Swissline, Cassette, Deluxe, Mono and Gastro. Can't seem to understand the differences between all of them. I really don't care about the stand or what attachments they come with (I'll be storing in a drawer and the attachments, from my understanding, can be used with any model and purchased separately anyway). Williams-Sonoma sells the "regular" and the "pro" whatever this means. Any and all info greatly appreciated. Oh, and I know some have longer shafts than others - this is important to me as well as the power of the motors. Thanks!