Gurugram property: Payment plan advice for folks selling their big home?

What's the scene with payment plans in Gurugram these days? Kids settle ho gaye hain, so I'm looking for a 2BHK, maybe 3BHK max. Apni current property bech ke, I'll have funds ready. Builders like Suncity push construction-linked plans, but is a lump sum payment smarter? Or should I just look for ready-to-move options around Nirvana Country? Don't want hidden costs later, you know, like OC charges ya maintenance deposits. Total kitna lag jata hai for a good 2BHK flat, say near ₹1.5 Cr? Need something low maintenance, with an elevator and near a hospital.