If you want to 'future proof' your system a bit, I'd highly recommend looking at a Threadripper desktop system. Since Daz is mostly Iray centered these days, and if you are going the Iray route, a 1950X (16 cores/32 threads) is more than plenty if you can find one on sale, but even the 8 core Threadripper parts are compelling. Why, you ask? The 64 PCIe lanes.
You can eventually build to a 4 GPU setup with Threadripper (2 x 16 + 2 x 8, or 4 x 8, with leftover lanes for drives, etc.), but you'll need to pick the right motherboard for such a setup.
You could also build an Intel HEDT system and go the 4x8 route (the x16 only gains you a couple of percentage points on rendering speed, more cards vastly offsets this), but Intel is generally more expensive these days.
Plus, the current Threadripper boards are 'forward compatible' with the upcoming 7nm Threadrippers. There's a lot of speculation about these, but at the very least a 32 core option (successor to the 2990 WX) is likely, possibly even a 64 core option if AMD decides that a 64 core Threadripper makes some sense from a marketing standpoint (Intel DID announce a 48 core HEDT processor...).
If you are considering 3Delight as your rendering engine of choice... yeah you can see why a 64 core Threadripper looks so attractive!
EPYC is also an option, but not really for the budget you mentioned. EPYC is the 'server' version of the Zen family, and has 128 PCIe lanes. And there are EPYC boards now that allow you to 'split out' the x16 PCIe slots for say an 8 GPU x8 setup... this is more of a pipe dream though. Threadripper does just fine in a Rendering environment. After the 3rd or 4th GPU, the gains from having multiple GPUs really falll off rendering time wise.
So I'd look at a decent Threadripper board that has 4 properly spaced full length PCIe slots, plus maybe a couple more PCIe slots for other stuff (You may need to get creative to use these though), and maybe start out with the cheapest Threadripper that you can afford (Iray renders won't benefit much from more cores), and the beefiest Nvidia card you can afford. This system will be highly upgradeable later...
Also, an NVME M2 drive for your OS. You will appreciate the faster boot times later. With an additional, affordable large HDD to store most of your files on. I went the 2 TB Samsung 970 EVO SSD route, but then I didn't mind spending $700 (at the time) on an SSD. You can make do with a 512 GB for the OS just fine. Smaller maybe, but you'll fill up 256 GB rather quickly these days...
I'd also recommend locating Daz on a separate partition from your OS, preferably a separate internal drive. That way, you can transplant Daz more quickly into a new system when you are ready to move on to said new system. I have my Daz on my C: partition at the moment, which is a problem since that system just failed... I'm sure the C: partition is fine though, but I'll need to pick up an external NVME enclosure to relocate my Daz product, scene, etc. files onto the new system... I do have backups too, but not for the last couple of weeks. But I digress...
Yeah, give an 8-16 core Threadripper system a very serious look!
