The MSI GTX760 is an awesome card for the price at $260.
http://www.techpowerup.com/reviews/MSI/GeForce_GTX_760_TF_Gaming/27.html
Another factor is the THREE GAMES you can choose from with AMD (find the GOLD Tier of the new Never Settle) versus the free digital coupon for Batman Arkham Origins for the 760.
The MSI N760 TF also has really, really good customer reviews. It's a good idea to compare those scores when choosing a card.
http://www.newegg.com/Product/Product.aspx?Item=N82E16814127745
Shadowplay:
The NVidia card will soon be able to stream/copy gameplay video if that's a factor.
Summary:
- 3 older games versus 1 new one
- NVidia card has slightly more performance vs HD7950
- NVidia card costs $260 versus $200 for cheapest HD7950 (the $200 HD7950 has only an 850MHz GPU so it's not a direct comparison)
- better overall customer reviews for the MSI 760 versus any cheaper HD7950 (5/5 average 75 reviews)
You can't go wrong with a quality HD7950 but I think the MSI N760 TF is the best card at this price point.