Ghaziabad property's hidden costs are a real shocker

Been looking for 6 months now in Ghaziabad, especially Vasundhara. SRB Promoters ka ek under-construction project pasand aaya hai. My budget is around 75L for a 2BHK, but I'm worried about all the hidden costs. Log bolte hain sirf property price nahi hota, bohot extra kharcha aata hai. Stamp duty, registration, interiors ke alawa aur kya kya hota hai jo builders often don't mention upfront? Kitna buffer rakhna chahiye total cost se? Koi apna experience share kar sakta hai ki final mein kitna extra laga tha Ghaziabad mein?