What's the real all-in cost for a Gurugram 3BHK around Sector 57?

What's the real all-in cost people are seeing for a 3BHK in Gurugram, especially around Sector 57? I work in real estate, but buying for myself feels different, you know? I'm looking at some Ireo projects and also resale options. Builders always quote basic price, but the PLC, club membership, maintenance advance, and those crazy high registration charges add up fast. Honestly, is the Super Area vs Carpet Area game still rampant? It's tough to compare apples to apples. And for payment plans, is construction-linked still the smart move, or should I push for something else? I want to avoid nasty surprises at possession. What's the best way to calculate the true final cost without getting blindsided?