you can buy from letsbuy or flipkart, both of them sells genuine quality product. but flipkart's delivery is faster, so if price is same, then flipkart is preferable.
Now about the phone, I am a proud owner of defy. There are some not so good things about the phone though, still its the best you can get within the budget.
issues if you want to know,
not so good camera qulity
no dedicated DAC chip installed (digital to analog convertor) still delivers decent sound specially with poweramp.
Stock earphone is a PITA
the color of the rubberized back cover is fading a little
Defy comes within 14k I guess, Defy+ has nothing more than a bigger battery and slightly better camera module(bayer) and of course Gingerbread. Now, since Defy(or Defy+) has official CM support, unless you are not gonna use custom rom, buying defy+ over Defy is not VFM IMO.
One more thing, if you wanna stick with Defy+, I heard that its below 15k in Ebay, you might check there too. I bought my Defy From Ebay for 13.5k, when nowhere else it was available below 14.5k. and in Kolkata, those few shops, who had Defy in their store, was selling it for 15.5k-16k
You can buy from any one of them both are very good in all the aspects.
I have purchased many products like Sony laptop,HTC Incredible S,Nikon S8100 camera and many more things for myself and my friends and didn't had any issue with the packaging or shipment.
And I have also heard/read that "flipkart has bought letsbuy" is a rumor.
Apart from that you can also consider SE Neo V also,it is also a very good phone
No, its official. Flipkart has bought Letsbuy and Myntra. Thats why, No letsbuy coupons are available in market