I would have to go with the O.S but since your not racing i would have to go with the O.S .18CVR I have one in my xxx-nt and when i want to i can do wheelies all day long if i so choose. But i choose not to, but the .18cvr has a ton of power and is very reliable and is easy as he## to tune. And the .18cvr cost me $105 and the last time i checked on tower hobbies it was about the same.

But thats just what i would do in the end it's all up to you