Most of the cars mentioned here are certainly rare in India, but not cheap / easy to maintain, except perhaps, a few mentioned by Mayavi. However, the import duties for those will be high, which beats the purpose of keeping costs low.
I'd recommend Taarzan. It's rare - one of a kind - and you can always get it serviced by DC. I read somewhere that it's based on a Cielo, so it'll probably give decent mileage compared to other exotics.
ps. Will also save lives once in a while.
