Try ProjectorDelhi (ProjectorDelhi.com). I called them once and mind my words that guy gave me genuine guidance. Since he keeps almost all the brands and gets same out of those, so gave an unbaised reviews and some good quotes as well.
Another one is in Pune, ITGear.in. He too got lots of stuff, not sure of Optoma, but he too is a nice one and don't mind advising you on phone etc. But at the end of the day, they are there to make money. You also need to make sure for after-sales service as its going to be unplesant if you don't have an authorised one nearby.