Concerning harddrives & cd-romplayers on your A1200: I prefer using the bogstandard IDE connector for hooking up a 2.5" drive of max 4 GB. Although there are faster solutions, imo it's fast enough for everyday use.
For anything else, I use the SCSI-card of my Blizzard 1230-IV, which has a 4-drive SCSI tower connected to it. In my experience, a setup like this has the advantage of being more reliable than an IDE based setup, while being easier to expand. I don't like flatcables coming out of my computers...
The disadvantage of SCSI's higher cost is not so important: as my A1200 is old technology, it's perfectly happy with old (cheap!) SCSI-hardware.
