I'm a slow guy, and my 2011 EC250 is AWESOME. Very manageable power, pulls strong down low, but it will still put the fear of god in me if I get too abrupt with the throttle lol.
Yes its going to be more powerfull than the CR125, but its also easier to ride in my opinion as it makes enough grunt down low that you dont need to ring its neck to keep up momentum.
I was in the same boat as you, and I'm extremely happy with my Gas Gas purchase