ATi 5850 vs ATi 5870, worth the price difference?

I'm looking at buying a new video card, and I was looking at either a 5850, or a 5870. I have chosen that I want an XFX card, so I limited it down to here: 5850:... show more I'm looking at buying a new video card, and I was looking at either a 5850, or a 5870. I have chosen that I want an XFX card, so I limited it down to here:

5850: http://www.newegg.com/Product/ProductLis...
5870: http://www.newegg.com/Product/ProductLis...

The 5850 is $280-$325, and the 5870 is $390-$500. (The $500 is the 2gb card)

I was looking at some benchmark results, and I was wondering, it it really worth the difference?

I'm interested in some pretty heavy gaming (Crysis, GTAIV, etc.), and I'm coming from a 5770, so either of these will be a great improvement, but I am hoping to not have to upgrade this for a while, and I was just wondering what you guys think.

Also, cross-firing is not an option for me, so please don't suggest it.

My specs:

GPU: XFX 5770 1GB
CPU: AMD Phenom II X6 1055T
MoBO: ASUS M4A77TD
PSU: XION 700W
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