Need bigger/brighter nuvi 255W replacement

I am using a nuvi 255W on my motorcycle. I would like to ask you experts of all the Garmin models what model would provide the following:
Brighter screen than 255W (primary reason for considering change)
5" screen would be nice vs the current 4.5"
Ability to turn off 'auto zoom' (255W does not have this feature)
No loss of map details when zoomed out (keep same as 255W)
Pressure touch screen (like 255W)
Power cord (like 255W) vs powered base

I have no fears of purchasing discontinued models and don't care about map updates as roads are generally static.

I bought a nuvi 1450LMT but it auto zooms and drops surrounding map detail as I speed up or zoom out a bit. I will be selling it soon!!

Thanks in advance!!

John Nielsen