I've had some queries about what visa would be necessary to come to India to get married on.
Come to India on a Tourist visa. Get married, and after the marriage you will be able to get your Tourist visa converted to an Entry (X) visa on dependant status on marital grounds.
To do this you will need to get registered at the FRRO (post coming up on how to accomplish this) and there they will either tell you to go to Ministry of Home Affairs (MHA) in Delhi, or they will accept your application and send it to Delhi. I am not sure if it is necessary for you to take a trip to Delhi at all, but it may be required.
After 1 year of marriage you can then convert your X visa into a PIO card, by the same procedure.
All this can be done here in India.