Its a power hungry card for sure. If you value a 27W difference in TDP as 'vital' to your purchase, then get the 5850. But the 470 gives the better performance for the better price.. and you can't really argue that.
And this isn't even considering the fact that both Fermi GPUs give a +300% increase in F@H, and nearly +50% in tessellation. Sources below:
http://images.anandtech.com/graphs/n...5215/22216.png
http://images.anandtech.com/graphs/n...5215/22218.png
http://images.anandtech.com/graphs/n...5215/22211.png
Which makes your '5850 hands down' statement rather silly. Like I said before you can't really go wrong with either, but you'd have to give the edge to nVidia.
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