How long are you planning on renting the bike for? I looked around in Delhi thinking about buying an Enfield since it's taking a while for my Ducati to show. It's basically assumed you'll crash (traffic takes some getting used to) and/or ride an Enfield like it's a new bike (butcher the engine) so dealers don't like renting for short periods. You can buy a good used one for a thousand US.
I brought in US$1,000 with no problems. All of this has been actively discussed on ADV Rider with recommended shops. Like Nigel said, there's lots of great recommendations about Lalli Sing. It's a great country!