Minimig or FPGA Arcade. That or real Amiga hardware.
AND if you want a true Amiga experience (i.e, perfect smooth scroll and sound in PAL & NTSC software running on the custom chips that made the Amiga so great), AVOID emulation.
Emulation = audio latency , input latency , video latency.
FPGA reimplementation is the way to start with AMIGA today.