First property hunt in Noida Ext – feeling clueless

Visited Golf Horizon Llp in Block H last weekend. They quoted ₹85L for a 2BHK, saying prices are fixed, no negotiation possible. But I've heard ki Noida Extension mein log still manage to get some discounts. Is this true, ya builders just bluff? Honestly, I don't want to overpay. Also, construction-linked payment plan better hai ya down payment? My parents keep saying down payment is safer but EMI will be heavy. Should I just take the plunge with construction-linked for lower initial burden? Change my mind.