Grimmie is what I call us newbies to FE courtesy of Grim Racer, designer of the SV27.
None of us have really moved from the stock motor. Really no reason to as far as most of us are concerned. 33-42mph depending on setup is a wide margin without having to upgrade this motor (and that's with only using NiMh). But motor upgrade has been pondered. Here's the link:
http://www.rcuniverse.com/forum/m_49...tm.htm#4946770

I've seen other deep v boats, but none that are RTR with these speeds and around $450 with batts and charger.. If you want, check out BBY racing also. And MHZusa. The price will start going up. And the others, you will most likely have to purchase the ESC and motor also.

Every boat will have it's limit (some have busted 45mph on lipos and say she's still controllable). Room fro growth, I think so. If I want to upgrade the motor/ESC, I can, and even go higher cell count. But I'm happy with a 12cell config along with stock motor.ESC.