Builder's 'final cost' is never the final cost – change my mind.

Finally fed up of paying rent after 10 years in Delhi, I'm seriously looking at owning a 3BHK in Dwarka or Vasant Kunj. Meri EMI vs rent math ab bilkul clear hai. I'm seeing projects from DLF and Godrej, also Birla Estate. My main concern is construction quality – kya sach mein sab theek rehta hai? Friends ne bataya ki Tata Housing mein bhi plaster cracks aur seepage issues aate hain after possession. Aur hidden charges ka kya scene hai? PLC, EDC, registry fees sab baad mein surprise karte hain kya? Yaar, builders ka customer support after booking kaisa hota hai? Koi experience share karo please.