All time best was very recent - An A2000 with PP&S 040, DKB SCSI card, C= SD/FF, 17Mb ram total, with 3.1 on board = $0.00 This one was very well timed! Saved my sanity (I think

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Next best was a perfect A1000, With 2 Microbotics Starboard 2 - one with SCSI plus all the early programming software. Came from an early developer = $0.00
I have given away good Amiga systems to deserving homes over the years too. So, I guess it comes back to you at times...