Ok guys,been reading alot about all the problems with some of these units and I know this question has been asked alot on here but what would be a good gps/fishfinder for me?I can spend between 400-600 dollars on the unit...I think!!!I mostly want the unit to troll for crappie in the channels so that I can halfway stay in the channel.Also would be good to navigate the channels up and down the lakes.Would also like color.My boat is a 16' grumman stick steer so 1 location for driving and fishing.I will probably mount the transducer on my auto pilot tm.Thanks in advance!!!!