Real estate agent buying for himself — help!

I work in real estate, but buying for myself in Noida is totally different. My EMI vs rent calculation is going crazy! I'm so confused. Should I even buy now, or wait for a market correction? Everyone says Noida is the place to be, but prices seem high. Especially in good sectors like near Kakrola. Is it all hype? Kya scene hai? I'm looking at under-construction projects by B.L.Gupta Construction (P) Ltd. Heard mixed reviews. Anyone have experience with them? I know what builders don't tell you about possession delays, but ready-to-move is so expensive! What's the real rental yield these days? I'm hearing advertised yields are not achievable. Seriously need some off-the-record advice. Pls help!