Replies:
Part 1 (toeing the party line)
I would go with 240v, my experience is despite specs, marketing etc, 240v tools vs their 110v counterparts always seem to have a bit more oomph.
Also whilst it might seem anecdotal, I seem to remember someone saying a lot of the Kapex motor problems seem to be with 110v units.
Part 2 (my opinion)
A lot of the Kapex's appeal is its portability vs cutting capacity. If it's going to stay in your shed I'd consider the Bosch Glide 12" which has a fantastic cut capacity, power and accuracy, instead.