As far as I have heard Honda cars require a lot of maintenance and their spares parts are just too expensive
A well maintained Honda vehicle will not require lots of maintenance.
YES, parts are slightly expensive than Toyota, but not excessively expensive (local parts are brand new, and much cheaper than the parts for used JDM cars).
How much should I increase my budget in that case? I also don't wanna wait more as the prices can go unexpectedly high just like now.
Any idea about the city- i dsi's fuel economy?
Its great.
No exact idea about values, but I think, its better than 5th gen. Honda City.
A clean Mira ES 2014-15 model, imported and registered in 2017-18 will cost you around 1.35 to 1.45 Mn. You can find it at a lower price than that, but then it will not be in that great of a condition.