You can very well overclock the non-top card to beyond top edition speeds.. and its not the case that Top edition will overclock further since both use the same chip inside hence the OC capabilities are same for both. Maximum on default voltage is 1050 MHz for both of them on core clock.
Ask primeabgb about non-top edition of this card, you'll end up saving 3k. If not available then go for Top edition. The DCII cooler is just fantastic.
@lovedonator - Sapphire HD7950 OC is back on flipkart at 25440 !!!! And should be in stock in their werehouse as delivery time is only 3 to 5 business days this time around.
Sapphire AMD/ATI HD 7950 OC Edition 3 GB GDDR5 Graphics Card | Graphics Card | Flipkart.com
hmmm.... I posted as soon as I opened flipkart.com today thinkning that you might still be searching for it.
Dont get upset though, it happens all the time. Prices always fluctuate and the difference you paid is of 3.5k which is fine enough.