Looking for Motor advice

[ebfoxbat]

This is what I'm working with. I'm looking for a little more top-end speed.






I have room for 8 sub-c cells though 7 is better for buoyancy reasons. This is my parts list:
+Hitec Aggressor 3 channel FM
+Pro Boat ESC (the reverse and BEC are both "must-have")
But what motor should I use? She's 24" long or so and pretty heavy. I'm just not sure where to go with it.

EDIT: Crap, those images are huge. Stupid cell phone camera. How do I limit their display on the message board?

[saleens7]

i would say a 540 or 600 motor....

[ebfoxbat]

Sounds good to me, but that doesn't mean anything to me yet. This will be my first motor so I'm learning. I don't know what my stock one has in it. so I have nothing to compare it too.