I'm gonna assume for a second that when you say 180 that you have a Saito 180?

If so, for power-to-weight, the Cap is the way to go. Start with the CG at the recommended 27%MAC in the instrcutions and you'll be fine. My Sig Cap was my first large plane and we both survived.

What have you been flying?

BTW - I sold my Sig Cap to buy the new Chip Hyde Cap-X...It is an incredible machine.

Richard