2009 crewmax JBL complete amp replacement

What’s up yall, I’m trying to gather as much information as possible before I go ahead and start this process. I have the JBL system in my truck and it’s not the best. I have replaced my sub and front door speakers because they blew. Did not originally know that the front door speakers only receive bass frequencies. My question is what exactly do I need to buy for me to install a 5 channel amp and completely replace the JBL one? If I have the 5 channel amp and run door speakers and sub will my dash speakers still play? I already have the new radio installed and it will easily hook up to a new amp. Let me know yalls thoughts and personal experiences and facts. Thank you all for the help.

these are the links to the Amps I may get.
https://www.skaraudio.com/products/rp-600-5-car-amplifier

https://ds18.com/collections/5-chan...d-full-range-car-amplifier-2000-watts-compact

most likely the ds18 as I’m aiming for full ds18 set up.