Kinda depends on your budget. I never see anyone mention this, but we all want to have the latest,greatest gadget's. Here is my suggestion for what it's worth to you. I would figure the most I could spend on one unit, then I would go to BassBoatcentral and watch their electronics for sale thread. Some real bargains to be had on complete 2 unit setup's at times. You might find some barley used acceptable units for your budget. Those guys change out units like we change socks. Main thing is take your time, do your research and get the most bang for your buck.