Congratulations - cement flooring is spectacular. If you are in a colder climate, you will definitely want to heat the floor.

Have your concrete supplier give you colour tests so you can approve the tone of the cement. You can also acid wash cement to give it colour, texture, embellishments.

There is a school for concrete experts, the teacher's name is Fu-Teng Cheng. There is also one of the best books on the market by Taunton Press, here is the weblink:
http://www.tauntonstore.com/concrete-countertops-fu-tung-cheng-070599.html

i grew up in a house with heated concrete flooring. it was awful because the heat was not uniform and it took forever for the floor to get warm. also, you have to consider the furniture sitting on warm floors and rugs that will block the heat. it's hard to live with because you are walking on something too hard for the human body and it also forces you to wear footwear because socks wear out in a day.

We currently have heated concrete floors on slab & in upper floor of our house. It is very uniform in heat, but we do have to keep the temp at a steady level. It is more efficient to keep it at a comfortable minimum temp, rather than have one of the thermostats that is on a timer, going up & down throughout the day. The floor would take hours to get up to temp. from a cold slab. We find it to be a very comfortable heat system, but it has it's drawbacks. On the upper floor, we cannot move any plumbing, because of the pipes in the floor. This is a major bummer for us right now, because we need to renovate. Also, you have no air movement in the house, & let me tell you about the dust that comes from lack of air circulation! Also, no heat pump for central air. We are debating whether to renovate, or simply tear down & rebuild. Would I put in the heated floors again? Basement slab, probably, main floor, absolutly not.

Hey TDknight, excellent advice. I've also had great success with basement slabs in cement - but not too great for second/third floors. Thanks for your first hand advice!

Thanks for the great feedback to my question. the new house will be all on one level and we are in the high desert (approx 3300 ft elevation) so heating is not as much as a concern since we are in the southwest of Utah. Great suggestions