Legal risks in Gurugram property: Need advice

₹1.2 crore budget for a 3BHK near Dwarka Expressway, I'm finally taking the plunge after years of renting. Honestly, I'm really worried about legal stuff, especially with builders like Emperium Infrastructure. Kya RERA registration check karna enough hai? Is it just on paper ya really helps if there's a delay? Heard about Raheja Krishna Housing Scheme having past issues, so I'm super cautious. What are the actual red flags to look for in RERA docs, and what legal options do we have if they delay possession?