I purchased the saplings for Rs. 50 each which albeit expensive, were apparently from good stock and of good "Mallika" variety. Mallika is native variety to India and is supposed to quite disease-resistant. Of course, the fruit itself I have tasted and like!
When buying the saplings, I was surprised to see that they are grown as graftings rather than from seeds and upon further reading, now understand that the best mango trees are grown as grafts from existing, proven and productive trees. Apparently, trees grown directly from a seed (albeit of a very tasty mango) will not give good fruit, take a long time to fruit and will be very fibrous. Some useful info is here http://www.tropicalrainflorist.com/mango_trees.htm
Mango trees can grow up to 90-100 ft in height and should start yeilding fruit in 3-4 years. They make excellent shade trees and grow a pretty large canopy so should be planted at least 50 feet away from existing structures. Although we have planted them fairly far apart - I didn't check the exact distance at the time - we chose five different spots and dug a hole and have planted them.
I hope to have more actual on-the-ground updates on my mango saplings going forward and hopefully will be eating its fruit in the forseeable future too!
All in all, a really satisfying activity! Much better than spending 250 bucks on a move ticket...