Hi, Welcome to the Club.
Anything of C-Max size is going to feel big and sluggish coming from a Puma, even if it were a 1.4!
Ecoboost certainly has the oomph you'd crave, the older one the affordability.
I think you'll have to expect a drastic change if you went with the older model, try get 3-4 people on board so you can try worst case scenario, it'll need to be " worked " a little harder in each gear, unlike Ecoboost which has almost Diesel like Torque delivery.
2010 Titanium 2.0 TDCI Panther Black.