the rapidroad is your best option. connects to the clock port of your A1200.
but all A1200 clockport USB stuff needs drivers to be active. you wont be able to boot off USB keys or USB CD drives.
so extra requirements are ideally workbench booted of hard disk with the drivers installed, and some fastram
i have two rapidroad cards myself, and have had no problems - but again, that is a limited data sample set. and if we want to go anecdotal with no evidence; i remember people saying that their subways were dying back in the day, but that was due to plugging in the clockport cable the wrong way round and stuffing 5volts to something that didn't want 5volts i'd imagine.
