Webra .35
Or check cyberheli for the Hirobo .36. I hear it is a good motor.
I have OS and YS engines currently. But I would not discourage you from the Webras and the like. I have used them in profile hoverbatic planes and tuned a few helis with them and they seem to be nice. Also, maybe the Irvine .36 has more bang.
Don't know, but the OS .32 is lacking in power on the Venture. Run's reliably EVERY time but just not as much punch. You will be fine with it for quite sometime. One day it will be something you can sell to a beginner and then get the OS .50!.
Don't worry about it much. If you have to have more power then just get the Webra and be careful the first two gallons.
//Payton