I guess you missed the Above Link then
But with a larger Rs 12000 budget, I think we could find something higher performing.
Looking through your site, I would only recommend 2 cards beyond the 7770, either a GTX 465 or GTX 560.
The GTX 465 offers about 7% higher performance than the HD 7770 but draws significantly more power (more than twice as much); pricing is similar between the two.
The GTX 560 (non-Ti) offers about 32% higher performance than the HD 7770 (akin to the GTX 470 on the previous chart) and draws a little more power than the GTX 465 (just above the GTX 560Ti in the chart below).
I will go with the 560 options. The pricing for these models in your given link seem to be the sweet spot in terms of $/performance. It should perform at par with the 6870 but 6870 are considerably more expensive while the lower 560 are somewhat within the same price range as the 7770 & 6850 which performs lower.