If you want to milk, be very careful to get one with a good friendly nature, also make sure it has been well handled and not spookie or jumpie when handled. I think that applies to any breed, but I had trouble with a dexter, and dont take anyones word on it, make sure you see it handled, and then handle it your self. If you milk 2 times a day you want to be spending that time with a cow you like and get on well with .
If you aren't into milking, (a cow has to be bred to get milk, then be milked 1-2 times a day, then re bred), then perhaps get one as a pet. You can get bottle raised steers much cheaper, even get them already polled. They make nice pets... as far as the mini zebu. They have shows and things for them.