There are a few other smaller brands aswell.Basicly their great if you want to buy a reference card for cheap. can be as much as $100 cheaper to buy a reference card from them however they dont have as much backing and so their coolers are not as great in most cases. Check reviews. All we can say. If your worried about warranty. Basically every brand except EVGA has poor warranties. Their quallity however should all be up to atleast Gigabyte's standards.
thank you guys and specially MisteryAngel I trust Sapphire .. as I am not keeping any card more then 2 years and have luck so far that i never need any Support so i am going for it now 780Ti is my pick