Your current hair looks great, but change is a real mood booster, so if you want it, go for it! I love the Emma Stone cut Caro linked and the Katie Holmes pic too.
I think we are issues twins lately! My OT post is lamenting my hint of jowls and my hair is thinning and straighter than it used to be. I'm in the process of moving to the Emma cut...almost there...and I actually feel like it is hiding my jawline a bit. My old cut was more layers around the front and nothing to distract from it...this longer in the front look covers things up a bit, but is short enough to not drag me down. At least that's what I want to believe right now!