Upgrading to villa: is premium justified in Delhi?

Is the 'Premium Builders' corridor in Delhi already peaking, or is there still real investment value left? I'm currently in a 2BHK in South Delhi, thinking of upgrading to a 3BHK or villa. Already have a home loan, so trying to be smart. Prices seem high, but is the appreciation potential still there, or mostly priced in? Which sectors in that zone offer better long-term ROI? Any tips on spotting true value vs. just premium branding? How to factor in future maintenance or hidden charges beyond PLC? Hope this helps someone.