Aftermarket HU 2005 Prius, navi, no JBL

Hi everyone,

I am new to this forum! I recently acquired a 2005 Prius. It is pretty much in excellent condition, save for some dents and scratches that i will take care of as time goes by. I really wanted to buy a Prius for at least one year and finally managed to take the plunge! Very excited and satisfied with my purchase. This is a May 2005 German model (i am located in Europe), it came with Navigation, Bluetooth, but no CD changer, no JBL sound system, no mp3 playback... Basically, car description says 2005 Prius Sol Navi. I REALLY love this car and feel like a young teenage girl who got kissed for the first time However, the factory radio and the speakers sound... well... not good. I am a bit of an audiophile, although i would never sacrifice space to install a subwoofer in this car. Hence, i would like to replace them (first the HU, speakers later on). I rear this forum extensively, also looked at YouTube videos. I am not technically-oriented but i do like a challenge and i plan to do this install myself even if it takes me days.

So, my questions are: would a Pioneer AVH-X5800BHS be a good match for this car? I am probably not going to use the HD and satellite radio functions, so perhaps a cheaper model will suffice? Can i add a rear-view camera to it? (i really need one, parking in Europe is a nightmare). What harnesses / adapters would i need in order to make sure the AC and volume steering wheel controls keep working? I read about replacing factory radios on models with navigation (but those came with JBL as well), or models with no nagivation (and no JBL). My car is unfortunately in between... Is there a way to retain the functionality of the bluetooth steering wheel controls? And my last question: is there a way to make sure the lights for the steering wheel controls keep working?

Thanks in advance! Looking forward to your answers!