1st is the cheapest 1gb GTX 460 on the site, the 2nd is the most expensive 1gb GTX 460, and the 3rd is the only 2gb GTX 460 on the site. What is the difference between them and other brands of GTX 460? How can people justify spending the extra money?
For a start the "reference" cards are all based on the same clocks and should preforme about the same.
Some companies offer a "Custom" or "Super" card which maybe overclocked as standard from the facotry and/or have a custom cooler built onto it for extra cooling.
The difference between a Standard Card and a OC'd card is debatable. It does offer better preformance, but at a higher price.
The company offer some bundles with the card, some sneak in a little price boost to cover the cost, some offer mroe warranty.
Fact is, go with a card you can afford within your budget and liek the look of, if its the OC'd version then go for it. Get he card to suit your needs and at a price YOU think is perfect for your needs.
The best brands are Asus, MSI, EVGA and Gigabyte. They generally have top of the line warrantys ( EVGA is best with a lifetime ) and are a step above other brands. Generally even the mid tier brands are quite good and will still be great overclockers.
Definitely get one of the Gainward cards. Hopefully they are the GLH (Goes Like Hell) type. They should have a good custom cooler and high quality components. I read a review that showed the 2gb version only really made a difference in benchmarking and in the game Far Cry 2.