So this card leaked...
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12 GB of VRAM for $449 US sounds pretty awesome to me. This might be the new Daz budget king card, but of course it'll probably be unobtanium when it launches, between the scalpers and crypto miners hoovering them all up.
Nonetheless, once supply catches up with demand, yeah... or if you are particularly brave and can find a place to pre-order it, just make sure the seller has a decent return policy just in case some issue pops up...
As to how it relates to your build, others have given some good advice already. You can 'make do' with your existing board, but if you can afford to upgrade ATM, say to the Ryzen 5 3600 build as suggested by
recreation , well it's a thought.
The main thing I'd look at with Nvidia cards, as others have suggested, is the amount of Ram first (as it relates to the cards within your budget range), then the generation of card. I'm using a 1080 Ti. The RTX 20 and 30 series cards are faster, but a lot of my more complex scenes hit the 11 GB of VRAM wall pretty quickly, and a CPU based render in Iray is MUCH slower. Yes, you can optimize, but that takes extra time, and some of the time I end up doing multiple passes with say 1/2 or 1/3 of the total characters in the scene in each pass, then merging them in Photoshop... the point here being, the more VRAM you have available (to a point), the less likely your more complex renders will exceed the available VRAM...
The 24 GB RTX 3090 would be awesome, except for that $1500+ US Price range. Which is why that 'leaked' 12 GB card in the linked article above looks so promising...
If for some reason you decide that you aren't going to be doing Iray rendering (most people around here using DS are on the Iray bandwagon, myself included), at that point the GPU becomes much less important, as 3Delight and probably Filament are CPU based rendering engines. 3Delight has less support than Iray does these days. But if 3Delight is the way you want to go, at that point more CPU cores good! At that point, the 8, 12, or 16 core AMD options start looking pretty good... but for Iray, yeah 6 cores is probably plenty... But for 3Delight, pretty much any modern graphics card should do fine running the desktop and the Daz (non-Iray) viewport.
My personal advice is definitely arrange for at least 2 TB of drive space, as Daz Studio files plus your own saves add up space wise pretty quickly. For Daz Studio, HDDs are perfectly fine, and an SSD isn't going to speed things up inside of Studio all that much, and there are a number of 4 TB HDDs available in the roughly $100 range US (some more, some less). A suitable SSD for the boot drive is also a good idea, size based on budget (personally I'd suggest no less than 512 GB if you plan to install a fair amount other stuff on the C: partition), but you could install everything Daz Studio related on your HDD. 2 TB SSD's are around (I use these along with a HDD), and even larger ones, but as the GB increases the prices really start to jump up...
Food for thought!