Full analysis can be found in my blog, Head Heart & Hooves, on the Blogroll. The quick & dirty Pick 4 is as follows (numbers in parentheses are runners I will consider, use as backups, &c.)
1, 6, 12 / 1, 5, 12, (3) / 5, (1) / 3, 7, 9
In any case, I will use three horses in each leg and My Miss Aurelia as a single.