I feel among all the sectors in Noida, sector 18 and sector 32 will bring more appreciation in future because of the development of the commercial hubs.
Sectors 77 onwards, Sector 32 are the best sectors to invest. Sector 77 onwards because they are near developed sector and also near Sector 18 and Sector 32 (commercial hubs). Sector 32 because it is witnessing some good developments and real estate prices will go up because of that.
In Delhi NCR Noida is the best place to invest in. Noida sectors such as 77 onwards are witnessing good construction. The positive is that they are near commercial hub (Sector 18 and Sector 32) so appreciation will be good. Depending on budget you can also invest in Wave City Centre in Sector 32, Noida, where investment in commercial will be best. Appreciation in these two Noida Sectors will rise from 15,000 per sq.ft. to Rs 25,000 per sq.ft. in 2014. So you may go and check the details, see the location and then decide.
For mid-term investment, go for Noida Expressway because average prevailing price in the area is Rs 3500/- sq ft vis-à-vis the ready to move-in apartment where prices are Rs 6000/- sq ft. If we hold the property for next 3 years the expected price will be around Rs 5000/- plus sq ft.