Just my opinion...
I think it's really depend on your personal shooting style... what you like to shoot etc... i think now a day all camera produce decent image quality.. i saw some nice photo from GF1/2 and J1 as well... i got it from some magazine and from some forum feedback, some ppl love the nikkor 1 or j1... of course, no perfect camera in this world..it's all depend really what you want to shoot (said it again
)... that's why most of the time we end up with few camera... you might only know what want after purchase one
But, if you were to choose GF2, why not look into the new GX or Olym EP3? I tested both really not bad but i will not buy since i dont' have any m4/3 lenses and will not want to invest into another new set of lenses at this point
Also, in long run, what type of lenses do you prefer (or how economically available to us)... looking at the market now, m4/3 seem like a better choice compare to the new Nikon new mirroless's mouth
My comment may not help you but hopefully it help to give you a bit if idea what you should consider