I think it really depends on what you are looking to get out of the printer and how much expendable income you have.
I ordered a 0.2mm nozzle with the X1C combo but have yet to use it, 0.4mm gets pretty fine detail for what i’ve been doing and going to 0.2mm will get you much finer detail but much higher print times. Others with experience would have more input but I would consider it for very small miniatures but not much else. Some people like 0.6mm for mechanical parts and faster print times.
I believe it is random which plate you receive. I have never used the cool plate but I use the textured a lot and usually use a 3d effect or smooth for prints where that bottom surface is featured. They did just release a new plate today, it seems promising. All that said, again based on expendable income, I would want to make sure I had at least one textured plate, I would suggest reading this first:
Seems like a very good option to make sure you end up with a textured plate.
You should understand that in most cases you’re going to want to dry your filament before use, so you may want to investigate a filament dryer. The X1C can dry it but its not very efficient.
I also ordered a bunch of different filament types when I ordered it because I wanted to test out PLA, PLA-CF, PETG-CF, PA6-GF, PC, TPU, to experience the different mechanical and finish properties. Make sure to understand drying and printing requirements for each filament type you purchase.