If you don't need waterproof....
I have used the Garmin 1450 for years because it has one of the brightest 5" screens available. Only problem is, it is discontinued but you can still find them on the internet. If rain threatens, I just put it in a small zip lock bag (closure on the bottom so the power cable can remain connected and the closure slide orientated toward the power cord side when almost closed) and then hook it to the mount. Works great for everything but a hurricane (which has happened).