I own a Garmin Echomap 73sv and 93sv. Both excellent SI units for the fisherman on a budget. I think they retail for $999 and $1,199.
The SI and DI on these echomap units are the same technology featured in their high end GPS map units. They are simple to use on the water, simple to install and they came packaged with all the hardware I needed. The transducer included in the box handles your traditional sonar and all your DI and SI. No additional purchases required.
My experience with them on the water has been awesome. Best imaging on the market IMO. Really crisp, clear images. No learning curve. Rocks look like rocks, weeds like weeds…ect.