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There are several factors to keep in mind here. For large complex PDFs, you'll want a display that is large and high resolution and a device that has a reasonably good CPU. You have that already in the iPad Pro. Smaller displays may make your PDFs harder to see and read.
Do you need a color display? Do you need a display that has its own light, as most tablets do? If you want color, you may find color E-Ink isn't quite sharp enough for you yet.
Every device involves some sort of compromise. You'll need to decide if the size of the iPad Pro is worth it for the benefits of reading PDFS on that device. An 8 inch device is smaller, but will it be large enough to make your PDFs truly legible?
One device I'll suggest is one I have - the Onyx Boox Go 10.3. It does not have a light, so you'll need to use it in well-lit places that would be suitable for paper books. It's not color. However, it has a sharp display. It's available new for about $380 US. That may be more than your budget allows. However, I'd agree that, when push comes to shove, you have a great setup as is!
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