As per my uses, i am currently using domainadda.com to register my domains in India, i have more than 100 domains with them and i am getting and good support from them, even web hosting plans are very competitive and they provide very good support, from last 2 year i have not face any problem with them..
As per me Best 5 domain registration companies are
domainadda.com
net4india.in
godaddy.com
indialinks.com
crazydomains.in
What you say guys, i am right ?