The GTX 650Ti is faster. A highly overclocked 7770 will perform close to what a stock 650Ti does.
As long as they are close in price get the 650Ti. Also, don't forget to take a look at the 7850 1GB which typically doesn't cost much more than the 650Ti.
in India the 7850 costs around 14500-15000 Rs.check this--> 7850 cost
i.e. almost 5000rs more than 650ti that means 90$ more. very costly.
i cannot go above 10500rs. so I plan buy 650ti and oc it.
Is the palit version that i mentioned above good for overclocking?