Dexters and Belted Galloways are also small and dual purpose. The Galloways have the sweeter nature.
Interesting - I have heard a few comments about Belties being quite a handful. Some suggested they are just heedless of human frailties, whereas others have suggested that they can be downright aggressive. Dexters are considered by many to be placid, easy animals to handle. A friend of mine who kept them for some years said otherwise.
I was chatting about cattle temperaments with someone in here via PM recently, and I suggested that handling can have a big influence on temperament. That's not to say that there
aren't inherent traits in certain breeds (or bloodlines within the breed), but that it's probably not the only factor.
Regarding the relative sizes of smaller breeds, I believe that a 30-month old Dexter could be expected to be about 400kg lveweight. We sent our first Shetland steer away a couple of weeks ago, and he seems to have weighed-in at around 570-580kg.
Steve.