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Hello,Your budget will have a big impact on your selection. You can get a basic chartplotter for $300 or you can spend $5000 for something with all the bells and whistles.Some brands for you to consider are Garmin, Raymarine, Simrad, Lowrance, Northstar, Standard Horizon, Furuno, Navman, etc.Since your depth gauge is not working, I would get a combo chart plotter / sonar unit. Some of them are cheap, others are expensive. Features for you to consider:-Screen size. IMHO, get something at least 5". Bigger is better, especially if you want to display sonar, radar, AIS, etc.-NMEA 2000 for data in / out. This networking scheme is much easier to use than older schemes like NMEA 0183-Latest units allow you to add radar and overlay the display on the chart. Garmin, Lowrance, Simrad, Raymarine, etc. can all do this.In the spring of this year I bought a Lowrance LMS 337C DF combo SONAR / Chartplotter unit. I paid about $500 for the unit and $90 for detailed charts / marine points of interest for the entire US. I am very happy with the unit.Lastly, who will install the unit? If you are not going to do it, you can easily spend $1000 to install the unit. Some of the Edson mounts are hundreds of dollars, and that is just the mount!Good luck,Barry