You wrote that you are looking for a flash-based hard disk solution, and this gives you one which is CF card-based. You also get a second hot-swappable CF card slot for easy file transfer. Moreover, more RAM (needed to make good use of the hard disk and for WHDLoad), Kickstart 1.2, 1.3, and 3.1 (freely switchable) incl. Workbench 3.1, a clock-port, a way to mount A1200 turbo cards if you ever wish do to that, etc. Even a boot-selector for the floppy drive. And that for 140€ and no need to even open the A500. Sounds pretty much what you want.
Any other solution will set you back quite a bit more, starting with the reason that your A500 has Kickstart 1.2 (unless someone upgraded it), which can not auto-boot from hard disk. So you would need to upgrade the Kickstart, try to find an old hard disk attachment for the A500 (rare and expensive, also these were often SCSI), add more RAM, buy a CF card adapter, and what not. And the result will be slow and clunky.
You can also buy internal accelerator cards that have IDE or an SD/CF card slot on-board, but then of course you are buying a CPU accelerator.

I think these are all in the same price range as the ACA500plus, too.
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