I am condsidering buying a 2010 Nitro Z-7. It comes standard with a 150 Optimax. I am trying to decide whether it would it be worth it for ME to upgrade the engine to the 175 or 200. I mainly fish small local lakes that are only a few hundred acres. I only go to the big lakes 6 times a year at the most. I don't care so much about top end speed. I just want to make sure I have a decent hole shot. $3,500 is the price of upgrading to the 200. That is a lot of money to me. I don't know what it cost for a 175 upgrade. What do you guys think?