The 5770 is going to be ~$160 at launch.
RV770/790 is already EOL, they are still working on clearing inventory.
As far as replacing the 4890, there are a couple different schools of thought.
One is to just overclock the 5770 to around 950mhz and just let that fill the gap, others are thinking that if they could use a lower binned Cypress, either a really slow 1440SP chip or maybe a 1120SP chip w/ decent clocks would fit in pretty well as a 5830. The last possibility is that they left some room for the 5850/5870 to drop once GF100 is released.
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