Tony I like my 9z. The 10x is good also, but the 9z offers a little more flexability. I do not own a 9c but I can't imagine that you would not be able to get the mixing you want.

As for the engines both would be fine. I chose a BME 110 on a comp-arf for weight, so there is another option. It is about 2 lbs. lighter and runs well. All are good running engines if you know what you are doing. Some are more forgiving to the novice.
You will hear lots of opinions but I don't think the wt. of the cans will cause much of a problem. Lighter is better though.

I do not own your plane, but know people are satisfied with them. As for those servos no one can complain about them.