Smaller flat search: Broker vs direct builder confusion

Two years ago I'd have laughed at these prices, but now that the kids have moved out, I'm seriously looking for a 2BHK in Block 2. Tricone Projects ka ek flat pasand aaya hai. Builders initial price kuch aur batate hain, then broker adds charges. What's the real all-in-cost? Stamp duty, registration, PLC, parking sab mila ke kitna upar jaata hai from the advertised price? Is it better to negotiate with the builder directly or through a good broker? Not sure.