That's right, the GTX 460 is the only other graphics card that has been permenently stationed on my testbed as of late.
I had thought about the 560 Ti, but without trying it I could not add it to my graphs. What you will see however is that the 560 will match and probably outpace the 6870, given that it has 48 more stream processors (over the 460), higher core/memory clocks and the scope to overclock further.
I maintain that the 6870 DirectCu is a nice enough product however it would need a RRP around the £175-180 mark to really make sense.