I use heliproz for everything I own...they are great. Most of your questions have been answered already...but let me add that getting a coaxial will only allow you to fly indoors(in theory a large coaxial could be flown outdoors I guess with no wind)....so a smaller heli like the mCX is probably better for indoor practice. If you do plan to fly outdoors...I think you will probably get bored pretty fast with a coaxial heli. </p>