Does any clever audiophile person out there know which SD card is best for music storage and use with a B&O? There are all sorts of different types of SD out there with different speeds and classes and wotnot and I haven't got a clue which to go for. Do I need a 'HC' card and is there any benefit getting a higher Class rating if it's just for music storage? E.g. There's no point spending 50 notes on a Sandisk SDHC Class10 when a standard Tesco SD Class 1 will do just as well!... I intend to store Lossless files for maximum quality so will probably have to go for a 64 gig card. Thanks very much in anticipation...