Avalon, yes, as a fact Sapphire GPU's are usually cheaper, have better warranties, and sometimes pack a better cooling solution.
Thing is ... the X1800 XT from Sapphire, at the very moment (they only have one version of the XT so far) has the BBA reference cooling. Just like any stock speeds XT on the market. Only difference in, or on the card is a freakin' sticker.
The only XT variant with a different cooling is the mega over-clocked one from ASUS. But even ASUS' version at stock speeds use the reference cooling.
My point here is ... when you buy a GPU, a non-Built-By-ATi one, then what is telling you it's better.
Don't you want the card itself to be better ?
Or you just want a "better" warranty, maybe better for a period of two or three months.
Or you want to save what ... 10, 15, or 20 bucks ?
If you want to simply save money, then, hey ... I do understand that. And I say go for it. It's alright.
But if you can financially, technically afford a BBA XT right now, go for it. And then buy a decent third party cooling, like Zalman's VF700. That even Sapphire "better coolers" couldn't beat.
And, personally, I find it difficult to believe that information. It might not be the case. Write an e-mail to Sapphire, or call them, to get the real information from them, if you're so mind focused on getting a Sapphire product, then I believe you should, as a responsible consumer. But that's just my opinions.