Yaar jo bhee is selling his car, for a lower price than the market price either he is tired of it or it is giving him problems so before buying anything get it checked from a good mechanic and not only the engine but the whole structure as well.
And another point to note is don't buy a car which is out of Market like if you buy a Suzuki Khyber and one day you decide that I want to sell it, that car is ready cash on the other hand you will not be able to sell spectra.
Whenever buying a second hand car please keep money for the following - Just in case
Oil Change
Brake Fluid Change
Transmission Oil
Power Steering Oil
New Tyres ( if you do a lot of out of City travelling)
Battery
Power Windows are just cosmetic options I am sure you can get a lot of those things once you buy a good car, lot of those things are very cheap now.
So good luck on your hunt.............