My first and only classic Amiga is an A2000HD.
I don't remember the exact dates, but I did some upgrades over the years. It started with OS 1.3, later upgraded to OS 3.1. I added some extra fast RAM, a SCSI CD-ROM drive, a second SCSI hard drive, an external floppy disk drive and a MicroWay flickerfixer card. Never added an accelerator card so it always operated as a 68000 CPU at original clock speed.
redfox