I have just bought theDSC-WX10 compact digital camera. I know it needs SD , but i have no idea what class or speed i should get??? I have started researching & i just keep getting more & more confused. I have also read reviews where other users have got a that isnt fast enough which has slowed down the camera when in use which i also want to avoid. What class & speed of SDHC do u think i need for this camera to be able to use it to its full potential??? Class 4, 6 or 10?? And what speed, 20MB/s, 30MB/s or higher??? Any advice or help would be greatly appreciated!!!