If resale is something that you are not considering, then go for a Chevy Joy 1000cc or a Cherry QQ 800cc. No doubt about it.
Cherry has a much higher bhp to offer than Cuore and rivals almost that of Santro. Plus it's internal cabin width is same as that of Santro's and larger than Joy's.
Joy has the highest bhp to offer amongst all the locally assembled 1000cc cars. It is second only to Vitz, which is imported. Since it is lihgter than Vitz, it offers more power-to-weight ratio than Vitz. Which means it has a real outstanding acceleration. Furthermore, it is also brand new and without any parts or maintenance issues.
Both these cars offer much more space than Cuore and cost a lot less than a Santro. But are way better in performance and ride than both Santro and Cuore. Review the brochures available online, on Pakwheels and also on their respective web sites, for the technical specifications and compare all four cars.
You will realize the difference on paper as well. Cherry offers test-drive. Go evaluate it. I am sure the Nexus people won't deny you a test drive either for the Joy.