Brad, thanks for your response. Rough guess here, but the thought would be remove a wall and take the current 12x12 kitchen, and combine it with the 12x12 dining room, thus creating a large kitchen. The entire first floor would have all the flooring replaced as well, and new drywalled ceilings so there's that expense too. For the kitchen there would be moving of utilities, potential moving of windows, etc. Mid-high end everything would be my initial thought. I did something similar at my last house, but did all the work myself, if I remember right I was at $10k all in, but it was a much smaller space.
Thanks,
Tom