First of all, congrats!
A biased opinion since I was in your situation not so long ago and chose to go to Kellogg. I started out with GSB being my first choice but felt Kellogg might be a better fit going through the application process. I think with your background, your obvious choice would be at K. I would suggest that you attend classes at both schools to figure out where you feel more at ease. I think one plus for Chicago would be that you will have a lot more flexibility if the economy completely goes bonkers. But then again I expect the halo currently on Chicago to come down slightly with the collapse of the IBs (financial recruiting will not be so hot in the coming years and students might turn to more traditional industries).
ps: I just started school on Wednesday and based on the two classes I have attended, I am convinced I am going to have a lot of fun there. I hope to see you in Wieboldt Hall soon