Graphics Cards

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The only graphics card for the A1200 is the BlizzardVision, but you need to have a Blizzard PPC to use it. It will fit in the case, but you need to take care of the power/heat dissipation issues.

You can use OS 3.9 without a graphics board allright. I believe OS 4.0 on AGA is also possible. But probably not a pleasant experience. Note that you need a Blizzard PPC for OS 4.0. And 4.1 is just not present for classic amigas.

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Once again, there's no 4.1 for classics. You can't use 4.1. You can only use 4.0, which you can buy from your favorite retailer.

As for the experience, I don't know, I have a CyberstormPPC+CyberVision setup, I bought and installed 4.0 just for the sake of it, but I still use my ClassicWB setup mostly. 4.0 don't have drivers for my X-Surf ethernet board, (you need to do some tricks to use 68k drivers I believe which I didn't bother) and generally some pain to setup properly. Your mileage may vary though. Check youtube for some videos to see how it looks like.