Keitt is always the best to extend the season, although Neelam is also very late. Neelam can be kept smaller, but some do not like the flavor. Keitt has a good traditional mango flavor. Early, you could go with a rosigold. One of the earliest mangoes and pretty much bullet proof. Probably tastes similar to philippine, although I would say better. And easily kept small. Sweet tart is a good mango, but it is vigorous and will be hard to keep 12 ft. I would also suggest Carrie for taste and I've seen multiple blooms from them. Some say they don't like the flavor, so possibly try one first. Also are people who seem to think they are susceptible to some new strains of anthracnose. I have not observed that yet. I am in 9b, Brevard.