You will not be disappointed in your choice for the cap-x.I would suggest a moki 180 for power.
This is what i have in my cap -x and it has unlimited vertical.I run a perry vp-20 perry pump
a 24oz. tank over the c.g. It did take a little bit of playing around with the engine to get it to run right, but I had to add no extra weight.THis plane is awesome I flew the hell out of mine yesterday and will get to fly it again today,and i just can not get over this plane.
My brother has flown caps for a long time and he warned me about tip stalls so when I got this plane I was very intimidated.This thing is amost a trainer it will due fly by and land almost hands off,locks right into a harrier,will hover for ever the moki will pull it right out of a hover no problem.If you need any help let me know or ask rwlewis on the cap x thread he his were i got my set up from.