I would recommend Gen 8 yes, simply because it has the most assets, many content creators for daz have switched over to G8F by now, so it will continue to have content (its still relatively new, I don't know if G8.1F will take over or what the difference is other than a fix in the mesh I can only assume).
As for actual assets, it depends on what kind of curvy you like. Lots of the characters styles I like tend to be G3F but I couldn't use them since I stuck to G8F because I wanted all my morph's to work together. While there are lots of assets, at least for my kind of curvy I like, there was nothing stylized that matched my interest, so I've used a lot of general body shaping morphs, export to blender, sculpt, and then re import back into daz to use as a base for most of my characters.
I have bought a lot of (curvy) character morphs, and this is what I'll say: Character morphs are great for rapid prototyping and great for finding out what kind of features you like most. However, the issue I found is that I pretty much never use them. The reason being, lots of the time when trying out character morph's, I'll really like parts of it, meanwhile, other parts of the morph I won't care for. Worse yet, because they are character morph's, the are full body morphs, so I can never use them because they will mess with the rest of the body. So while it is good to have body morphs to rapidly prototype when you are frustrated and don't know what kind of body you want or how to get the body you want, I rarely actually use them consistently (at least for my art style).
Maybe in the future I'll may a write up on how to get around this (possible to just select the part of the morph you like and mix together characters), but I use blender and I'm pretty sure there or more daz focus tutorials for how to do this already. But in general, the assets I recommend are the ones that I mainly use to create and tweak characters bit by bit, rather than whole body morphs. As I stated, my solution for curvy characters is to make a base morph based on experiments and finding combinations I like, fixing them in blender with some sclupting, and then using those as a base and blending between them at times, and then still using these assets to tweak each character
My main assets are:
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(pretty much my main tool for designing the body)
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(my main tool for toying with boobies)
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(My second favorite breast asset because it has a lot of style)
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(I occasionally use this to add style to different parts of the body that my Shapeshift can't do without a lot of tweaking)
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(Gohzoituz has more on their website of their older works, but basically Goh's morphs have always been the closest to the style I like, but doesn't have too many G8F character. Clarissa is the only character morph or full-body morph that I consistently use(I think 30% to 50% on the slider), but that's because it roles the hip to thigh transition just right to match what I'm going for, where shapeshift can not. But I only recently started using this asset, after already having developed my own base assets which I use first).
If you are interested in more body morph's I'd seriously suggest many of the morphs by Anagord (
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for example) who makes lots of content (be careful when browsing their page, all the really great outfits you will see are just textures, not the actual outfits themselves).
beyond that, experiment, see what you like, and look into ways of sculpting or tweaking characters once you've tried everything and still can't get it perfect.
Edit: I believe with all the above links, I've linked just about every main store I use to find things, the daz store, renderosity, renderhub, and renderotica, I also really like
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, poser content is a different program from daz, but I think they are managed by the same company so you will often see the two programs being discussed in the same space. Poser Content has lots of Daz content and I like their site because it makes it really easy to browse through assets and I think it does a better job than renderosity and render hub at recommending other similar assets to those you are looking at (and the web site isn't much of a store, it just links you to all the other websites where you can actually by the asset).
edit 2: use render erotica to find the nsfw stuff like genitals and toys