Hmm. Thanks for all the feedback so far. Seems that LSD and 'shrooms are indeed quite solid choices for a roll, and are not just the most famous because LSD and shrooms are themselves the most well-known 'classic' psychedelics.
I'll try to avoid turning these into "what should I take?" questions, but two specific hypotheticals for y'all; in your opinions:
A) beyond the differences you notice in LSD and psilocin themselves, does either one seem to synergise significantly better? A lot of people seem to prefer candyflips to hippyflips here - is that just because people tend to like LSD more / find it more euphoric and recreational? To the one or two people that mentioned LSD+shrooms+MDMA, do you find this adds much as opposed to just taking one or the other? I hear combining shrooms and LSD isn't that great, but I've never tried it.
B) given the option to have either for free (or at least for the same cost), would you prefer a smaller dose of LSD (or shrooms), MDMA and a small dose of a 2C, or just LSD/shrooms and MDMA but with a larger dose of the tryptamine? On a related note, I find the suggestion to take 2Cs after MDMA rather than before to be counter-intuitive; wouldn't the long-lasting stimulation of a 2C dose just make the comedown of MDMA all the worse?
Right now, it's sounding like the 'classic' shrooms or acid followed by MDMA as the peak approaches method of flipping is generally considered the best or at least near the top, and there's a lot less agreement (as would be expected, I suppose) regarding which RCs work how well in flips. I'm leaning toward a moderate dose of LSD and MDMA with nitrous, herb and maybe DMT, and holding off till I've tried the classic flips before venturing into RC flips, but I'm still contemplating the addition of a small 2C dose.