This x1600 looks good to me
http://www.overclockers.co.uk/acatal...aGX_2d120_2dSP
512megs of onboard ram operating at 128bit width but on a 256bit ring bus, 12 pixel pipelines @ 500mhz (6000 pixels/s fill rate, compared to 6800 gs' 4800 max and the 6600gt's 4000max) 5 vertex shaders and 8 geometry lines. All for £105.69
not to mention its an X1k series ati so it has all the latest bells and whistles (shader model 3.0, avivo).
Looking at the vga charts, the x1600 pro should slot in just ahead of the x800 pro (faster core slightly slower ram) which would put it ahead of the 6800gt in most cases. As said its using the new ati 500 series arch so should be faster than its older bigger brother.
Big review on the x1600
http://www.lostcircuits.com/video/sapphire_x1600pro/
Scrap what i've said it appears i've been duped by the ati marketing system, the x1600 is really a 4 pixel pipeline card at heart much like the x600 it replaces. So infact an x800 is quite alot quicker as its a true 12/16 pipeline cards