I think you should check out answerable.com They are from the directi stable so should be reliable unlike others.. the prices hav fallen a lot $4.5 or soemthing like that if am not wrong for a domain... Indialinks act funny at times, they didn't let me register a domain saying it might infringe copyright or trademarks! wtf!
I too tried to register a domain at indialinks no communication from their side for one week after ordering the domain ya it's true. i phoned them after one week.then they said that domain is infriging copyright,trademark blah..blah....blah..
Make sure you check the second year reg price, your cheap domain may not turn out so cheap. Also as others mentioned support and policies are a big consideration so it can be better to go with one of the bigger registrars.
i found yoursdomain.com n whiz.in supporting paypal....and both having sale for 1st yr. .in domains...