Dont get it yet. ATI is planning to do a price drop on their Radeon products early this week.
the 4850 will be priced at $130, and the 4870 will be priced at $150.
They are so cheap that I am planning on purchasing the 4870. But I dont have much use for it since my 8800GT does fine for me. But I will keep this in mind. But it is really tempting, especially after seeing the benches compared to the 8800GT.