I just went through switching over a few months ago and did a ton of research before doing so.
Make sure you consider what soft top is right for you. I really strongly considered going with the Trektop NX but ultimately went with an OEM because I really don't care for having the sunrider feature, I like to be completely topless.
I scoured the FB marketplace for a few weeks until I found one that worked for me. At the time it seemed like the going rate for OEM tops was about $200-$500 depending on condition, so comparable in price to a Rampage or Pavement Ends. I decided to go this route, and even though my top is not in the best condition, I got the frame and all the hardware for less than half of what a new Bestop set would cost. I figure I'll run the crappy top for a while (I keep it down 99% of the time anyway) and when I get sick of it then I can just buy a Bestop replacement and have saved a ton of money over buying the complete kit brand new. If you want to put together all the hardware you need from Bestop it's going to be well over a grand.
The main parts you will need are:
Windshield Header Assembly
Bow Assembly
Sport Bar Bow Bracket (You may already have these installed)
Door Surrounds
Tailgate Bar (you may already have the brackets installed for this, if not you can order the bar+brackets combo)
Bow Knuckles (even if you find a top with all 4, do yourself a favor and buy a set of the quick release ones)