What's the real all-in cost for a 2BHK in Noida Extension?

Sector 27 – I've been eyeing this area for a 2BHK, maybe around ₹80L. I'm based in Dubai, so can't do site inspections myself, makes decision-making tough. Titania Infratech came up but I'm worried about the *actual* all-in cost. Builders quote one price, but what about stamp duty, registration, PLC for a corner unit, and then interiors? It adds up fast. I'm wondering if a construction-linked payment plan is smarter for an investor like me, or if outright down payment gives more leverage. Also, should I even bother with new launches? Secondary market deals in Noida Extension sometimes feel like better value, especially if I can negotiate. Has anyone found better ROI with resale properties there? Worried about hidden charges popping up at possession time, especially since I'll need a power of attorney and a property manager.