The bonus of going AMD is that you can always upgrade later. Unless you go 5900x+, or plan on doing some overclocking later on, then you really shouldn't need to upgrade the motherboard (unless you're looking for multiple m.2 slots or something of that sort.). That should be fine for now.
I believe the 3060 performs better than the 2080s and are (surprisingly) close to ti versions of that card. Seeing as I have a 2070 Super that performs more than fine with Daz (hard to beat the 30 series speeds, though. Especially when you consider MSRP prices vs performance.), I don't see why a 3060 couldn't outperform it from what I've seen of the GPU. I'm just going off of stuff I've heard about the 3060, I don't have any hands-on experience with it. I've been using a 3080, so my expectations of its speed may be skewed, but I've read good things on it. Some more people on the Daz forum talk about it
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(and give some benchmarks, etc.).
It's been so long since I've had that little memory in any system that's it's hard to give you an objective answer here. 16GB should be fine, but that might want to be the first thing you upgrade. Make sure you're able to find the ram you're buying with the system now later, though, it'll make it cheaper to upgrade later instead of buying a whole new kit of ram when/if you upgrade.
You might have a little trouble getting Daz to read an external HDD for the assets, but there's been some people who've made it work around. A google search should be helpful with that. If you do go the internal storage route later on for purely asset storage, a Sata SSD (2.5") will be slightly faster in loading, but not enough to demand the price difference (in Daz, at least). An HDD will be fine. Of course, this all assumes you plan on getting more serious about it later - as in developing your own VN or something of the like.
