What about Touch of Asia around 103rd St. Hasn’t it been there forever?
http://touchofasiaindianfood.com/
I saw it on Yelp, and it was tied for #1 with 4 stars, along with Korma Sutra, but on their web site, it doesn't have a buffet. Instead they have something called "Thalis" which appears to be a very involved menu with a lamb dish and a chicken dish, but I'd rather try a wide variety for my first time.
It does look awesome, though.
Mark