It's not that simple, because you DON'T need to throw outrageous amounts of money at hardware JUST so you can render "complex scenes" using Daz.
I worked in IT, Network Operations, and Computer Security for over 40 years. Have been using "home computers" for graphics intensive simulations (state of the art flight simulators that can bring even the most expensive home computers to their knees, etc) since the 1980's, and will give a much easier solution for the types of "graphics processing of complex scenes" than spending thousands of $$$ JUST to upgrade a computer for Daz rendering.
Learn how to render your "complex scenes" one part of the scene at a time, THEN combine those "parts" with something like Photoshop, GIMP, etc. I'm not going to write a "How To..." in this reply...someone can use Internet searches to learn the skills needed to do it.
But there are PLENTY of people here rendering "complex scenes" using 5 year old laptops or desktop computers with less than $1000 GPUs by rendering PARTS of the entire scene separately, then combining them using Photoshop, GIMP, etc.
If you aren't doing Daz graphics rendering professionally, you don't need a megabucks computer setup to do it. Heck, even the professionals WITH the megabucks computers still use Photoshop, etc.
Now, if you are talking GAMING, then YES, you may have to spend the money to get better CPUs and GPUs to keep up with the latest and greatest gaming titles, etc . But even then, it may depend on how much of the "bling" in the game's graphics settings you are willing to turn down at any given time in the game/simulator.
Gaming vs Computer Graphics creation/rendering like using Daz are two completely different sets of requirements. So, if you are wanting to buy/build a computer for BOTH gaming and graphics rendering (like Daz), spend the money/buy the hardware for the GAMING intention you want to achieve. Then run Daz the way you "have to" to get the render quality you want, including using multi-part rendering of scenes (when necessary), then post processing the "parts" together using software like Photoshop, GIMP, etc.