For some reason, I'm beginning to hate it when people give out suggestions with-out backup reasons.
First of all Chevorlet Joy is not 800cc, its 1000cc, your probably reffering to the Chevorlet Exclusive which is 800cc and imported. Your requirements are to have good fuel economy and lower running cost, for both of these cuore would suit your needs. Why?
Because now Exclusive/Joy is discontinued and parts and etc would be much more rare and expensive. Cuore is an 850cc car and is damn good on mileage especially if ran on CNG. But nevertheless it gives awesome average on petrol also.
Cuore's resale is better than JOY. But it still isn't as good as the suzuki's.
I stated the facts, now it's time for you to make your choice.