The larger can of the "40" series motors can help dissipate heat better. They also have more torque and will work less than a "36" series motor for a given prop/setup. I have a few Leopard motors, but if I was buying my next motor I would try a TP Power Motor. I have read and many people here will attest that they deliver great power and are very efficient.
A note on brushless motors and efficiency:
A motor has a listed KV, but efficiency loss actually delivers less KV
Example, my 1450KV motor if it was 90% efficient would deliver 1305KV.
When you charge up your LIPOS, it's actually 4.2v x 6 cells, or 25.2 volts, not 22.2 So my rig should be capable of 1305 x 25.5 = 32,886 rpms (unloaded on the bench whith fully charged battery)
Then you have to factor in the motor under load and those efficiency losses. In my datalogs my average loaded rpm for my boat is about 28,000-29,000 rpms depending on which prop and how the hull is set up.
It took me a long time to work through all of this with my first boat, it's been 3 years I'm boating now and I just start to feel like I got a handle on it. Just keep asking questions, there are a lot of smart guys here who have done it all before. Don't just throw money at motors, props, and speed controls.
NEVER SATISFIED RACING
Fine Design 32 V-Hull 4082+6s
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