The Garmins have good screens and the UI is excellent.
You don't even need to read the manual- you can hop in a boat with one having never before seen it and navigate anywhere with ease.
Here is a great electronics link for those wishing to learn more.
There are links to several plotter radar shootouts if you dig as well as great info on the latest marine goodies.
Laveycraft 2750 Ilmor 710
Laveycraft 20.8 Sebring 406 SB
Fleetwod nitrous toy hauler
Yamaha raptor 700/Kawi KFX 450