It costs $499 + taxes in the U.S. so yeah, that sounds pretty reasonable to me.
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I love Safari 4. It launches in a second and page-loading is even faster, which I didn’t think was possible (given than v3.1.1 was already so speedy).
There are two problems though—opening the Apple Store still makes it unresponsive for a few seconds and it doesn’t scroll properly in the areas within a page, like a text box that has a scrollbar. It’s really irritating.
But I’m willing to deal with those minor bugs due to the superb performance boost.
Of course, all of this pertains to the Mac OS X version.