Assuming that you're asking "What motor SHOULD I get?", I have to say "That depends on what you want it to do". Just as you can't expect a car like a Geo-Metro to go from 0-60 in 5 seconds (but rather would need a Corvette for such), getting a motor in the $90-150 range that can only provide 18-25 lbs thrust will move you on a lake fine, but be somewhat slow. The advantage of the cheaper/smaller motor is that it uses less power, so you can have a smaller battery and/or it will last longer. If you want one that can handle a rivers current or move you faster, you may need one with 30-40 lbs thrust range that will cost ~$175-250. Going bigger than that is probably not a good idea since this boat manual says "Max motor weight ~20 lbs" and even the 40 lbs thrust model will likely be 25lbs weight (or at least that's what mine is). If you want to know about name brands, look at reviews to see if there's lots of "Poor quality" ones or such, otherwise many will do a fine job.