The MSI V and GigabyteE GV-N760OC-2GD w/ Core Clock = 1085 MHz / Boost Clock = 1150 MHz, have great coolers, custom PCBs and beefed up VRMs, are nicely clocked outta the box and historically overclock very well.
The Asus card would previously have been in the above group and while it also shares a great cooler, custom PCB and beefed up VRM, and great OC potential, Asus' decision to equip all that w/ a puny overclock(Core Clock = 1006MHz / Boost Clock = 1072MHz) knocks it outta the league with the othe rtwo.
The EVGA Superclocked also has lower clocks outta the box than the top 2, and a very good cooler, though EVGA this time has gone non-reference with this SC card, the VRM they used is merely a different brand and brings nothing extra to the table. Among all the cards available, the SC is one I'd never touch....the EVGA Classified is a great card but to pay a premium price for a reference card with a "stock equivalent" VRM, no way.
The Zotac Amp I think is currently the highest clocked 2 GB card available on newegg but I'm not as ye comfy with the Zotac Brand.... but getting there.
Ya might be wondering about the 2GB versus 4GB thing .... take a peek at this to help w/ ya decision making
http://alienbabeltech.com/main/gtx-770-4gb-vs-2gb-tested/3/
As for which of the top 2, it comes down to aesthetics and price.....The MSI is the more attractive of the two on it's own and it's a better match with Asus RoG MoBos and Mushkin Redlines .... two products oft found in enthusiast builds.