I have a herd of Garmin's on my boat and they are excellent units.
As has been said, go up to a 5 or bigger. The 4" units are just too small when you want to use the sonar and GPS in split screen mode.
You're better off going with an Echomap Plus or Echomap Chirp unit with the Canadian Lakeview maps built in rather than the basic GPS of the Striker units.
These are the 7" and 9" Echomap Chirp units on my boat.