I can't really say I believe in a specific model, but to my knowledge, and for the current version of our world, welfare states seem to be doing the least worse currently. But really, I think our world is kinda too fucked up right now to be able to have any good social-economic system (in terms of maximum equality and minimum suffering, I guess.)
Ideally, I'd prefer no state, only local communities managing themselves (something like city states, maybe?) and their relations to other communities... but I know it's just a dream, at least for the foreseeable future, considering the current realities and the ass-people in power. Because that would need many really peaceful, non-greedy and non-selfish people, which... well, never mind.
P.s. Sorry for the pessimism, and I might be wrong of course, which I really hope I am.
Then what is it? A teapot in the sky?
If it's a viable plan which can be realized, then how to achieve it, without killing people and creating a dictatorship? Is it possible?
I might be wrong, but it seems to me that any effort to establish communism will eventually fail with a lot paid in vain, and many lives lost, as has happened so far.
If that viable plan needs time to be accepted more widely, then maybe we should simply wait and try to be decent people in the meantime, instead of trying now to establish a "temporary" dictatorship actively as a way of "transition". And if the plan can be acted upon right now, then again the question is how (without resorting to violence and tyranny, of course). That question remains open to me. And it's a big one.