Well you can't convert to rupees directly from newegg, you must to know how prices are in rupees. Also It's totally OK to post in rupees instead of dollars, because by seeing it you know where are you from and how prices are like.
Hmm... 6670 is great for you, it should be below 5000, the DDR3 version. However you can add a little bit (just 500 rupees) to get the GDDR5. The memory type will boost the performance. And does not matter when you have DDR2 SYSTEM memory or such, because these are SYSTEM, not Graphics memory