I just moved from a 2006 Grande Punto 1.4 Active Sport to a 2011 Punto Evo Sporting. I have only had it for 4 days so its too early for a comprehensive review but these are the things I have noted:
Sporting has a considerably firmer/sportier ride
Sporting squeaks like a boss, need to sort the rear squeak out for sure
Loads of extra power and torque
Lots of extra gadgetry like skydome, leather interior, cornering lights.
I like the boot release on the Fiat badge although I like I can use the fob as well still.
I like that I can deactivate the start/stop and not have to deactivate it each time on startup. My active sport did not have start/stop to begin with though.
Overall I would say its a lot more fun to drive but the price you pay is refinement. The active sport was more compliant over bumps but then I swapped as I wanted a sportier car and that is what I have so overall I am happy with the change.
To answer your original question is it worth the extra 2K? For me yes that 135hp engine is very nice over the 77hp one I had before. Only you can really be the judge though, its your money, if you are asking I tend to think you are not sure. Go with your gut feeling, it will usually be the correct choice.