Since they are all reference design for the moment, they are essentially the same but they came with different bundles and different warranty and different customer service center and sometimes slightly different price like $10 different only and sometimes with free shipping.
For the Lifetime warranty, it depends on where you live. In North America, XFX, EVGA, BFG and Visiontek would offer you lifetime warranty but if you are in Europe or Asia, they won't. Anyway, since you were looking at Newegg (website for North American customers), I would assume you are living in North America so if you go with brands like XFX or Visiontek, you would get a lifetime warranty while Sapphire would offer you 2 free games instead of 1 and HIS would offer you 1 game included HIS Toolkit. It is up to you to decide what bundles and what warranty you want and which customer service you trust the most and what price and shipping cost you prefer.
Please also note that XFX has the highest rate in reselling because they just don't offer lifetime warranty but double lifetime warranty so the warranty could be pass to the second-hand buyer and this is why XFX could be a good choice especially in case if you are interested in reselling your video card later.