My family's upgrade dream is hitting hidden costs.

Sector 74 — been looking at this area for a bigger flat for my growing family. DLF Central 74 looks amazing but yaar, the advertised price versus the final total cost of ownership is just crazy. They quote one figure, then add PLC, stamp duty, registration, maintenance advance... it just adds up so much. OSB Expressway Towers is in budget, but I'm worried about carpet area efficiency. My wife's main priority is usable space for the kids. Has anyone bought in DLF Central 74 or OSB? What was your final out-of-pocket cost? Aur kitna extra pay karna pada after all the hidden charges? Does DLF actually give good usable space considering its premium?