So right off the bat you can safely ignore the 4GB variants because the extra VRAM will not give you higher FPS, even for 1440p (speaking generally.)
MSI is a reputed brand in GPUs so I would not be worried. There are various reviews online for you to sift through.
Here's a sample comparison I've found between the Zotac, EVGA ACX and the MSI lightning http://www.xbitlabs.com/articles/graphics/display/geforce-gtx-770-evga-inno3d-msi_9.html#sect0
a second review by comparing GB, EVGA and MSI. http://www.anandtech.com/show/7392/the-geforce-gtx-770-roundup-evga-gigabyte-and-msi-compared
All in all, you won't see noticeable performance difference, it's the thermal/acoustic aspects as well as customer service you're choosing between different brands. At these prices I would recommend the MSI N770.