First of all, you have come to the right place! Here you will find keepers with years of experience who will be glad to help. My own personal experience with this species is limited to a year and a half. But I will tell you what I know. The Eastern Indigo is by far the most beautiful species on the planet. Period.[opinion] And they have the most incredible personalities. In that respect, they are unlike any other snake I have ever seen. As far as serpents go, they are quite intelegent. Their gentle, lovable nature is legendary. That is what makes them so saught after, and to a large degree has caused a decline in wild populations. I personaly cannot imagine either of my specimens ever biteing me on purpose. They just don't have it in them. Sometimes they will put on a big show, with hissing, postureing, and tail vibrating, but it's all a bluff. The only way to get bitten by an indigo, in my opinion, is to get down right careless when feeding, or when breeding. And even then it would be your' falt for not useing proper techniques, and it would be an accident on the part of the snake. They just don't have a mean bone in their body.
As far as the size issue, first of all because of their gentle nature, size is realy not an issue. Exept to say that they do require a fairly large enclosure. And as with most captive snakes the keeper can, to some degree, control how big they get by the size of the cage and the amount they are fed. Personaly, I want mine to get as big as possible, so I keep them in the biggest cages I have space for, and I feed them all they want, almost. Don't want them to get obese. Some have been recorded in the 8-9 foot range, but most don't get quite that big in captivety.
So go ahead man, you won't regret it. And they are not constrictors. And because of all the new constrictor laws going into effect all over the country these days, and the reasons stated above, I can forsee a rise in demand with no end in sight. So don't get one,...get at least a pair, breed them and spread the joy. Good luck,
Tony.