No idea how much overall, but a quick example from the early days of my a1200....
the latest state of the art canon bubblejet £240
300meg hard disk, err I mean Sweet FA (the twats at software demon legged off with the cash) £300
another 300meg hard disk £300
blizzard 1230 IV £160
a whopping 16mb of memory £100
a whole 2x speed cdrom £200
bloody hell that's loads. argh. I've spent a load since then as well