Yeah, I know the feeling. I'm having a hard time trying to decide when to pull the trigger on a Core based tablet. I'd like to wait until at least Haswell, but if 7W SDP IVB slates have good battery life and weight and a good keyboard dock then I may get one then. And then upgrade when Broadwell comes around.
But it's tough. While Win8 has done wonders for my first gen Atom based slate, it doesn't help much with actual productivity software.
They other drawback is that the Kupa X15 is going to be a tad on the expensive side. Their previous Win7 based Kupa slate was more expensive than the competition as well due to its business focused nature.
Regards,
SB