First-time investor in Noida, total cost ka confusion

Pre-launch deals from Grisha Dream Homes for Lagerstroemia Estate in Sector 150 look tempting, but what are the real hidden charges jo possession ke time pe aate hain? I'm an investor looking at a 2BHK around ₹80L, trying to calculate the *actual* total cost of acquisition. Is the pre-launch discount enough to cover all the PLC, maintenance deposits, club membership fees, and other unexpected kharche? Ya open market deals lena better hai jahan sab kuch clearer ho? Also, construction-linked payment plan versus a bigger down payment – which one is smarter for managing these unexpected costs and getting better leverage for ROI? My parents keep saying builders ki hidden fees hoti hain, aur I don't want to get caught off guard. Noida mein aapki kya experience rahi hai final cost surprises ke saath?