ATI (I'm going to keep calling them that; going to hate how cleaning crap off my computer I am no longer going to be able to differentiate between old CPU and CPU drivers/nick nacks/rubbish) are going along the lines of the intel tic toc approach. IMO we're not seeing so much competition as continual evolution much as intel are ahead of AMD (as above).
There is no way the 450 competes with the 5850; we're talking 5750 levels.