You may also want to consider the ZS110 model which is the baby of the ZS family, has a 1.6 engine!
I have to say i love mine it goes really well & does everything i ask of it, no doubt the 1.8 will have more low down torque but the little 1.6 revs like a nutter & is great fun to drive!
It really does depend what floats ya boat really, but theres a good choice between engines, 1.6, 1.8, 2.5 petrols & not forgetting the 2.0 Turbo Diesel models.