Solo,
The figure 8 will require a fairly large space like a baseball diamond.
I have a T-rex 450, King2, and a CP Pro. The 450 is easier to fly compared to the K2, but the K2 is easier to fly compared to the CP Pro. Typically the bigger they are the easier to fly. However the bigger they are the more money they cost. I hear a lot of talk about the King 2 and I can verify that it is an excellent heli for the money and they really do need a brushless motor. It is not a heli that can be flown inside a house. Not a normal house at least.
Xtreme now is making upgraded parts for the K2 and I have them all in stock but we have not had time to add them to our webstore.