Anort3 suggested one from "You need P67, Z68, Z75 or Z77.".
Please read this review....ASRock extreme 6 or MSI Z77A-GD65. Both are great Z77 mobos; the latest and affordable. You can overclock your i5 2500K. It is a great CPU to stretch it to the limit. But, get an aftermarket cooler (noctua nh-d14, cooler master h612 or corsair h100). http://www.tomshardware.co.uk/z77-extreme6-z77a-gd65-z77h2-a2x,review-32434-22.html
The best part of these two mobo is that you would be able to upgrade IVY Bridge down the line.
What is that Rs? Is that the Indian Rupees or some other country?