Last fall the Houston Press asked readers to send in nominations of people who were breaking new ground in the arts around here.The lucky winners have been named and will be getting a $2,000 check at a dinner Saturday and -- perhaps more importantly -- they are profiled in the Press today. (Well, maybe the check is a bigger deal.)It's all a part of the Press' Artopia bash, dedicated to food, booze, art and fashion.Who are the MasterMinds? A husband/wife team of visual artists, a group of high s