Just for those who like me have one of the older 503CW cameras, I thought you may be interested to know that Hasselblad UK can upgrade the Flash Iso dial from the older ASA1000 limit to the newer ASA3200 one for a total of £200. I dont think this is too bad and certainly a cheeper option than swapping the whole body. It really gives a much greater control over fill flash.
Richard
Richard