Question on Trim selection and mods/customizing

Hello, I'm looking to buy a 2015 Prius in the next week or so, and I originally was trying to decide on a Three or Four trim. However, after finding this forum and being impressed by the wealth of mods and customization available, I'm wondering how basic a trim I should purchase and just add the mods of my own liking.

1. Does anyone have any recommendations about options that would need to come from the dealer (i.e. the navigation/touchscreen or solar roof)?
2. Does the standard touchscreen have any proprietary features that I would lose if I upgraded the head unit to an aftermarket (would I lose AC control, hybrid engine diagnostics, etc.)

Thanks in advance for your help. I'm considering getting a Three with a solar roof installed at the dealer and install turn signals into the side view mirrors and upgrade the rearview mirror myself, but just wanted to double-check first

 

Thanks for the suggest Burna, I saw your mods and they look amazing. Another question I had was whether upgrading the touchscreen would cause me to lose functionality.

Thanks