Stuck on payment plans & hidden costs for Duhai 3BHK

Budget finalised, loan pre-approved – now stuck on which payment plan to choose for a 3BHK in Duhai. I work in real estate but buying for myself is totally different, yaar. Paradise Homes ka project dekh raha hoon, price ₹78L bol rahe hain. But all-in cost kitna jaayega? Stamp duty, registration ke alawa PLC, parking, OC... yeh sab mila ke kitna extra lag jaata hai usually? Construction-linked payment plans smarter hain ya down payment waale, as an investor? Builders ka toh alag game hota hai. Koi experience share karega Ghaziabad mein?