Need to buy a smartphone under 13000 INR for my sis. Was planning to buy the Nokia lumia 520 or 620 as no other android phone in this range offers a smooth and lag free experience but the problem with 520 while using a friend's phone was that it got heated way too much which is a big NO NO (That's like her top priority). Guys please tell about some other phones which you think are good.
Thanks in advance for your replies.

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For windows Look out for lumias.....
For Android S advance. Look nowhere else.
Has got official JB update recently. Keep a watch on Homeshop18 Superdeals. Last when I check it was going for 12495.
I feel that the Galaxy S Advance is a pretty old device (running android v2.3). Also the biggest problem with android devices at such a price point is that they tend to lag especially after installing a few apps and games. Whereas Windows phone 8 only have occasional lags. That's the big problem.
Agreed Win8 is more refined than android but here 768mb ram compliments well to 1ghz dual core cortex A9. Samsung Phones below s advance are sheer Crap IMO
Had experienced my frnds s advance & Grand duos & s advance felt bit fluid than Grand. In fact grand hangs a lot in mutitasking.