Fed up of renting in Noida — my 2BHK search

Okay I'll be honest — I'm completely fed up of renting. Finally taking the plunge for a 2BHK in Noida, maybe Sector Sigma 3. Home Option Propbuild projects dekh raha hoon, but confused about pre-launch pricing. Kya early-bird discount actually worth it hai for an investor, ya baad mein bhi similar rates milte hain? Construction-linked payment plans mein ROI sahi hai ya down payment option?