I've collected much more than I had BITD but the only item I ever got rid of was my broken 800XL. It broke the day after my Amiga arrived with a red screen and I always thought that was suspicious. I always regret getting rid of it as I know now they are fixable and it had a wonderful keyboard. Oh well.
My final BITD setup was my orginal 600XL with 1064 expansion (it resumed service after the 800XL death) with two 1050s and a 1010. I loved having two drives when playing Alternate Reality: The Dungeon and the Wizard's Crown games or using Synassembler.