To all who commented, I guess to each his own. No, I don't plant mangoes just have an extended season, I plant quality varieties I like (other than a select few, by early August or so I have basically reached mango burnout and other than Neelam, I would pass on most of the available late varieties). If I have extra and want or am able to share, then thats great but to me I have no reason to fill up space just to say I have this variety or that variety (no offense Harry). If I was growing for sales, that would be totally different.
I have tasted a handful of abiu and while I do love them, they are not all "wow" where I would want to plant that variety just to say I did. I would actually want to plant the varieties I know are good and can and will produce (I have seen abiu that are decent tasting but only produce a handful of fruit each season). To relate this to mangoes, I have approximately 100 varieties of mangoes at my disposal but after tasting most of them, I can honestly say I would only want a fraction of them in my yard even if space was no issue...I would rather have multiple great varieties then singles of average or a different type of fruit...there are too many types of fruit and never enough space.
As Sheehan said, if you want a grafted abiu, then Noel's trees are the way to go IMO. The trees are proven producers in Florida and quality is excellent. If you are looking to be able to say you have x, y and z varieties, then by all means search them out and plant them. There is no right or wrong, I was just stating an opinion as some people seem obsessed with certain varieties based on what they have heard or read...approximately 4 years of waiting to find either joy or disappointment.