Checked the price at work today. The Essential Visions are the same price as Extremes. Philips Rally's are roughly the same price as the Narva 100/90W equivalents though.

The Essential Visions are the same whiter colour as Blue visions. And both of the cheaper ones are your normal colour ranges so will look a bit more yellow.

I'd probably go for the ebay bulbs as mentioned above if you wanted the whiter colour as it's going to save you a lot of money.