Wait, SIDs tunes are replayed nice with DeliTracker and EaglePlayer on classic Amiga machine in software, without the extra cost of SID chip.
They are replayed "ok", but playsid misses filter emulation etc. i recommend you try sidplay-residfp if you are going to emulate the sid.
as for the argument about moving from classic etc, i have moved. i last got a z68 mb with core i5 cpu, and a free os that works well for me. the amiga was never just about the "os" to me anyway. that came much later. it was about the games/demos etc.
I have a ppc mac mini here, and if morphos was available for a significantly cheaper price or free, I would no doubt have a play with it on the mac. same for os4. but they are imho overpriced, and developed in a way that doesn't interest me (private source and clubs/teams).