I would go with Texas Longhorns. I know they have horns, but once you become accustomed to the horns its not bad. Plus, there are many, many shows to go to and a lot of really great people. I have been showing Texas Longhorns since I was 5 my brother and sister have been showing since roughly the same age. Although most people don't think of them this way, Longhorns are generally a very docile breed.
One thing that youth in the Texas Longhorn Breeders of Tomorrow (TLBT) showing Longhorns have that nobody else has is the Autobahn Youth Scholarship Tour. At 3 shows a year (Dallas State Fair of Texas, Fort Worth Stock Show, and then the TLBT National Show) scholarship money is awarded to the exhibitors that place in the top 5 of each class, and then the top 3 in showmanship. In 2005 there will be $130,000 given to the kids, and this money goes straight into an interest-gaining scholarship fund, that is to be used for post-high school education (college, trade school, etc...). My sister won over $10,000 in just a couple of years, more than enough to pay for her entire cosmetology school. Money can also be put into the account by yourself for your kids college funds.
Just something to think about...
Ryan