I troll for crappie a lot here in Arkansas in the summer months and it is a great way to take the Grandkids out on the lake. Lately I have been contemplating water temp at different depths. I am thinking of installing a Downrigger mainly for temp and speed info. Do I want electric? Which temp and speed indicators do you guys like? I have been looking at the Fish Hawk. I am not looking to spend more than necessary but mainly I want to be happy with it.Which Downrigger do think would be best? Thanks in advance for the help. Oh yeah,My boat is a 17.5 ft deep V