don't forget shoe size inside leg and credit card numbers laughs

Seriously have a look here

http://www.mobilemarinemodels.com/motors-67-c.asp

there is an array of motors different power levels. What you choose really depends upon so many factors its hard to advise in a vacuum.

Also what batteries and size of the hull, what tug is it we can help!!!!

Mark

Brushed or brushless? How many Escs? Tx/rx set?
Easier to offer help if we know this info.
dave