I wouldn't bother with a HD floppy drive if all your disks are 880k DD floppies. Amiga HD floppy drives operate by spinning at half speed when accessing or writing to the 1.76mb density. Get any 880k replacement drive and convert your old floppies to adf's ASAP before it is too late and they are all corrupt.
(edit) I see that you need the HD floppy drive because you are finding it hard to find floppies that are DD. I have an Amtrade HD drive in an A2000, but have not used it in a while. I had a little trouble with it, but it works intermittently on HD disks.
