I'd go with: 1) duncans, 2) any kind of hardy LPS like euphylias (torch, hammer, frogspawn, etc). 3) toadstool leather.
i'd personally stay away from any of the "encroaching/spreading" softies like zoas, xenias, palys if your end goal is a mixed reef that will include other kinds of stony corals (either LPS or SPS). The reason isn't necessarily b/c they are not good "beginner" corals - in fact they are some of the most hardy ones with low requirements and have amazing colors. The issue is that because they are so "beginner friendly", once you get better at coral care, they will grow super fast and quickly cover your entire rock structure.
I went this route when I started my reef journey and ended up regretting getting these softies for this reason - esp a lot of their requirements (dirty water, low light) is not as compatible with a lot of other coral species if you want a lot of variety in your mixed reef. IMHO these corals do better in a dedicated "softie" tank. I ended up tearing down and rebuilding my entire rock structure b/c it was so hard to remove them once they start spreading.
if you still want to have colorful "soft" corals that are easy - you can also look mushrooms like ricordea or discosoma - they tend to spread slower than the softies named above.